diff --git a/Cargo.lock b/Cargo.lock
index fe0c5ce..4afec45 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
 version = "0.5.3"
@@ -8,10 +10,10 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "0.6.8"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -24,20 +26,20 @@ name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "arrayvec"
-version = "0.4.7"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ascii"
-version = "0.7.1"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -47,7 +49,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -55,39 +57,44 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "autocfg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "backtrace"
-version = "0.3.9"
+version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.24"
+version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "base64"
-version = "0.9.3"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "safemem 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -103,15 +110,20 @@ dependencies = [
 
 [[package]]
 name = "bit-set"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bit-vec 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bit-vec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bit-vec"
-version = "0.5.0"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "bitflags"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -121,7 +133,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitpacking"
-version = "0.5.1"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -151,22 +163,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.2.6"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.25"
+version = "1.0.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "census"
-version = "0.1.1"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.5"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -174,19 +186,29 @@ name = "chan"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "chrono"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clap"
-version = "2.32.0"
+version = "2.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -201,13 +223,13 @@ dependencies = [
 
 [[package]]
 name = "combine"
-version = "3.5.2"
+version = "3.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ascii 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ascii 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -224,72 +246,82 @@ name = "cookie"
 version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam"
-version = "0.4.1"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "crossbeam"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-channel 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-deque 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.2.5"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.5.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.5.2"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.6.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.5.0"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "crunchy"
@@ -297,8 +329,8 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "downcast"
-version = "0.9.2"
+name = "downcast-rs"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -308,7 +340,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "either"
-version = "1.5.0"
+version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -331,32 +363,42 @@ dependencies = [
 
 [[package]]
 name = "fail"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure"
-version = "0.1.2"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure_derive"
-version = "0.1.2"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "filetime"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "synstructure 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -365,24 +407,45 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "fst"
-version = "0.3.2"
+name = "fs2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "fst-regex"
-version = "0.2.1"
+name = "fsevent"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fst 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fsevent-sys"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fst"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -399,7 +462,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures"
-version = "0.1.24"
+version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -407,8 +470,8 @@ name = "futures-cpupool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -426,7 +489,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "httparse"
-version = "1.3.2"
+version = "1.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -435,18 +498,18 @@ version = "0.9.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cookie 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "httparse 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "solicit 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "traitobject 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -456,7 +519,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "inotify"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "inotify-sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "iovec"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -473,15 +563,15 @@ dependencies = [
  "num_cpus 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugin 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "itertools"
-version = "0.7.8"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -520,31 +610,33 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.1.0"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "lazycell"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "levenshtein_automata"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fst 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fst 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libc"
-version = "0.2.43"
+version = "0.2.53"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lock_api"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -553,15 +645,15 @@ name = "log"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.5"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -574,24 +666,21 @@ name = "memchr"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "memchr"
-version = "2.0.2"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "memmap"
-version = "0.6.2"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -607,6 +696,46 @@ dependencies = [
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mio"
+version = "0.6.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "mio-extras"
+version = "2.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "miow"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "modifier"
 version = "0.1.0"
@@ -621,22 +750,58 @@ dependencies = [
  "sequence_trie 0.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "murmurhash32"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "net2"
+version = "0.2.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "nix"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "nodrop"
-version = "0.1.12"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "notify"
+version = "4.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "inotify 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "num"
@@ -658,7 +823,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -717,31 +882,28 @@ name = "num_cpus"
 version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.8.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "owned-read"
-version = "0.4.0"
+name = "numtoa"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "rental 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
-name = "owning_ref"
-version = "0.3.3"
+name = "owned-read"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "rental 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -758,7 +920,7 @@ name = "parking_lot"
 version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -767,11 +929,11 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -798,7 +960,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.19"
+version = "0.4.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -806,52 +968,152 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "0.6.8"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.3.22"
+version = "0.3.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.4.3"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.5.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_core"
-version = "0.2.1"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.40"
+version = "0.1.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -859,7 +1121,7 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -876,14 +1138,14 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.0.5"
+version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -893,10 +1155,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.2"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -904,12 +1171,12 @@ name = "remove_dir_all"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rental"
-version = "0.5.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rental-impl 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -921,23 +1188,23 @@ name = "rental-impl"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rust-stemmers"
-version = "1.0.2"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.9"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -955,12 +1222,30 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "safemem"
-version = "0.3.0"
+name = "same-file"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "scoped-pool"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "variance 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "scopeguard"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1001,17 +1286,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.79"
+version = "1.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.79"
+version = "1.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1027,29 +1312,31 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.27"
+version = "1.0.39"
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- "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.79 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "slab"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "smallvec"
-version = "0.6.5"
+version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
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 dependencies = [
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- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1074,149 +1361,154 @@ dependencies = [
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  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
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- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-version = "0.14.9"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
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- "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/Cargo.toml b/Cargo.toml
index cc4da1c..a73afa9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tantivy-cli"
-version = "0.7.0"
+version = "0.9.0"
 authors = ["Paul Masurel <paul.masurel@gmail.com>"]
 
 description = """Command line interface for Tantivy, a search engine library."""
@@ -30,7 +30,7 @@ byteorder = "0.5"
 log = "0.3"
 futures = "0.1"
 env_logger = "0.3"
-tantivy = "0.7"
+tantivy = "0.9"
 
 [[bin]]
 name = "tantivy"
diff --git a/src/commands/bench.rs b/src/commands/bench.rs
index 415bb04..808ca68 100644
--- a/src/commands/bench.rs
+++ b/src/commands/bench.rs
@@ -1,36 +1,32 @@
-use tantivy::Index;
-use tantivy::schema::{Field, Schema};
-use tantivy::query::QueryParser;
-use std::path::Path;
-use std::io::BufReader;
-use std::io::BufRead;
-use std::io;
-use std::fs::File;
-use tantivy::collector::chain;
-use tantivy::collector::TopCollector;
-use tantivy::collector::CountCollector;
 use clap::ArgMatches;
+use std::fs::File;
+use std::io;
+use std::io::BufRead;
+use std::io::BufReader;
+use std::path::Path;
 use std::path::PathBuf;
+use tantivy::collector::{Count, TopDocs};
+use tantivy::query::QueryParser;
+use tantivy::schema::{Field, Schema};
+use tantivy::Index;
 use timer::TimerTree;
 
-
 pub fn run_bench_cli(matches: &ArgMatches) -> Result<(), String> {
     let index_path = PathBuf::from(matches.value_of("index").unwrap());
     let queries_path = PathBuf::from(matches.value_of("queries").unwrap()); // the unwrap is safe as long as it is comming from the main cli.
-    let num_repeat = value_t!(matches, "num_repeat", usize).map_err(|e| format!("Failed to read num_repeat argument as an integer. {:?}", e))?;
+    let num_repeat = value_t!(matches, "num_repeat", usize)
+        .map_err(|e| format!("Failed to read num_repeat argument as an integer. {:?}", e))?;
     run_bench(&index_path, &queries_path, num_repeat).map_err(From::from)
 }
 
-
 fn extract_search_fields(schema: &Schema) -> Vec<Field> {
-    schema.fields()
-          .iter()
-          .enumerate()
-          .filter(|&(_, field_entry)| {
-              field_entry.is_indexed()
-          })
-          .map(|(field_id, _)| Field(field_id as u32))
-          .collect()
+    schema
+        .fields()
+        .iter()
+        .enumerate()
+        .filter(|&(_, field_entry)| field_entry.is_indexed())
+        .map(|(field_id, _)| Field(field_id as u32))
+        .collect()
 }
 
 fn read_query_file(query_path: &Path) -> io::Result<Vec<String>> {
@@ -43,60 +39,70 @@ fn read_query_file(query_path: &Path) -> io::Result<Vec<String>> {
     Ok(queries)
 }
 
-
-fn run_bench(index_path: &Path,
-             query_filepath: &Path,
-             num_repeat: usize) -> Result<(), String> {
-    
+fn run_bench(index_path: &Path, query_filepath: &Path, num_repeat: usize) -> Result<(), String> {
     println!("index_path : {:?}", index_path);
     println!("Query : {:?}", index_path);
     println!("-------------------------------\n\n\n");
-    
-    let index = Index::open_in_dir(index_path).map_err(|e| format!("Failed to open index.\n{:?}", e))?;
-    let searcher = index.searcher();
+
+    let index =
+        Index::open_in_dir(index_path).map_err(|e| format!("Failed to open index.\n{:?}", e))?;
+    let searcher = index
+        .reader()
+        .map_err(|err| format!("{:?}", err))?
+        .searcher();
     let default_search_fields: Vec<Field> = extract_search_fields(&index.schema());
-    let queries = read_query_file(query_filepath).map_err(|e| format!("Failed reading the query file:  {}", e))?;
-    let query_parser = QueryParser::new(index.schema(), default_search_fields, index.tokenizers().clone());
-    
+    let queries = read_query_file(query_filepath)
+        .map_err(|e| format!("Failed reading the query file:  {}", e))?;
+    let query_parser = QueryParser::new(
+        index.schema(),
+        default_search_fields,
+        index.tokenizers().clone(),
+    );
+
     println!("SEARCH\n");
-    println!("{}\t{}\t{}\t{}", "query", "num_terms", "num hits", "time in microsecs");
+    println!(
+        "{}\t{}\t{}\t{}",
+        "query", "num_terms", "num hits", "time in microsecs"
+    );
     for _ in 0..num_repeat {
         for query_txt in &queries {
             let query = query_parser.parse_query(&query_txt).unwrap();
-            // let num_terms = query.num_terms();
-            let mut top_collector = TopCollector::with_limit(10);
-            let mut count_collector = CountCollector::default();
             let mut timing = TimerTree::default();
-            {
+            let (_top_docs, count) = {
                 let _search = timing.open("search");
-                let mut collector = chain().push(&mut top_collector).push(&mut count_collector);
-                query.search(&searcher, &mut collector)
-                    .map_err(|e| format!("Failed while searching query {:?}.\n\n{:?}", query_txt, e))?;
-            }
-            println!("{}\t{}\t{}", query_txt, count_collector.count(), timing.total_time());
+                searcher
+                    .search(&query, &(TopDocs::with_limit(10), Count))
+                    .map_err(|e| {
+                        format!("Failed while searching query {:?}.\n\n{:?}", query_txt, e)
+                    })?
+            };
+            println!("{}\t{}\t{}", query_txt, count, timing.total_time());
         }
     }
-    
-    
+
     println!("\n\nFETCH STORE\n");
     println!("{}\t{}", "query", "time in microsecs");
     for _ in 0..num_repeat {
         for query_txt in &queries {
             let query = query_parser.parse_query(&query_txt).unwrap();
-            let mut top_collector = TopCollector::with_limit(10);
-            query.search(&searcher, &mut top_collector)
-                .map_err(|e| format!("Failed while retrieving document for query {:?}.\n{:?}", query, e))?;
+            let top_docs = searcher
+                .search(&*query, &TopDocs::with_limit(10))
+                .map_err(|e| {
+                    format!(
+                        "Failed while retrieving document for query {:?}.\n{:?}",
+                        query, e
+                    )
+                })?;
             let mut timer = TimerTree::default();
             {
                 let _scoped_timer_ = timer.open("total");
-                for doc_address in top_collector.docs() {
+                for (_score, doc_address) in top_docs {
                     searcher.doc(doc_address).unwrap();
                 }
             }
             println!("{}\t{}", query_txt, timer.total_time());
         }
     }
-    
+
     Ok(())
 }
-
diff --git a/src/commands/index.rs b/src/commands/index.rs
index a0a57b9..d822af7 100644
--- a/src/commands/index.rs
+++ b/src/commands/index.rs
@@ -1,42 +1,53 @@
+use chan;
+use clap::ArgMatches;
+use std::cmp;
 use std::convert::From;
 use std::fs::File;
 use std::io;
-use std::cmp;
 use std::io::BufRead;
 use std::io::BufReader;
 use std::io::Read;
 use std::path::PathBuf;
+use std::thread;
 use tantivy;
+use tantivy::merge_policy::NoMergePolicy;
+use tantivy::Document;
 use tantivy::Index;
 use tantivy::IndexWriter;
-use tantivy::Document;
 use time::PreciseTime;
-use clap::ArgMatches;
-use chan;
-use tantivy::merge_policy::NoMergePolicy;
-use std::thread;
 
 pub fn run_index_cli(argmatch: &ArgMatches) -> Result<(), String> {
     let index_directory = PathBuf::from(argmatch.value_of("index").unwrap());
-    let document_source = argmatch.value_of("file")
+    let document_source = argmatch
+        .value_of("file")
         .map(|path| DocumentSource::FromFile(PathBuf::from(path)))
         .unwrap_or(DocumentSource::FromPipe);
     let no_merge = argmatch.is_present("nomerge");
-    let mut num_threads = value_t!(argmatch, "num_threads", usize).map_err(|_| format!("Failed to read num_threads argument as an integer."))?;
+    let mut num_threads = value_t!(argmatch, "num_threads", usize)
+        .map_err(|_| format!("Failed to read num_threads argument as an integer."))?;
     if num_threads == 0 {
         num_threads = 1;
     }
-    let buffer_size = value_t!(argmatch, "memory_size", usize).map_err(|_| format!("Failed to read the buffer size argument as an integer."))?;
+    let buffer_size = value_t!(argmatch, "memory_size", usize)
+        .map_err(|_| format!("Failed to read the buffer size argument as an integer."))?;
     let buffer_size_per_thread = buffer_size / num_threads;
-    run_index(index_directory, document_source, buffer_size_per_thread, num_threads, no_merge).map_err(|e| format!("Indexing failed : {:?}", e))
+    run_index(
+        index_directory,
+        document_source,
+        buffer_size_per_thread,
+        num_threads,
+        no_merge,
+    )
+    .map_err(|e| format!("Indexing failed : {:?}", e))
 }
 
-fn run_index(directory: PathBuf,
-             document_source: DocumentSource,
-             buffer_size_per_thread: usize,
-             num_threads: usize,
-             no_merge: bool) -> tantivy::Result<()> {
-    
+fn run_index(
+    directory: PathBuf,
+    document_source: DocumentSource,
+    buffer_size_per_thread: usize,
+    num_threads: usize,
+    no_merge: bool,
+) -> tantivy::Result<()> {
     let index = Index::open_in_dir(&directory)?;
     let schema = index.schema();
     let (line_sender, line_receiver) = chan::sync(10_000);
@@ -76,7 +87,7 @@ fn run_index(directory: PathBuf,
     } else {
         index.writer(buffer_size_per_thread)
     }?;
-    
+
     if no_merge {
         index_writer.set_merge_policy(Box::new(NoMergePolicy));
     }
@@ -88,8 +99,6 @@ fn run_index(directory: PathBuf,
         info!("Indexing the documents took {} s", duration.num_seconds());
     }
 
-
-
     match index_result {
         Ok(docstamp) => {
             println!("Commit succeed, docstamp at {}", docstamp);
@@ -98,7 +107,10 @@ fn run_index(directory: PathBuf,
             println!("Terminated successfully!");
             {
                 let duration = start_overall.to(PreciseTime::now());
-                info!("Indexing the documents took {} s overall (indexing + merge)", duration.num_seconds());
+                info!(
+                    "Indexing the documents took {} s overall (indexing + merge)",
+                    duration.num_seconds()
+                );
             }
             Ok(())
         }
@@ -111,7 +123,10 @@ fn run_index(directory: PathBuf,
     }
 }
 
-fn index_documents(index_writer: &mut IndexWriter, doc_receiver: chan::Receiver<Document>) -> tantivy::Result<u64> {
+fn index_documents(
+    index_writer: &mut IndexWriter,
+    doc_receiver: chan::Receiver<Document>,
+) -> tantivy::Result<u64> {
     let group_count = 100_000;
     let mut num_docs = 0;
     let mut cur = PreciseTime::now();
@@ -121,7 +136,11 @@ fn index_documents(index_writer: &mut IndexWriter, doc_receiver: chan::Receiver<
             println!("{} Docs", num_docs);
             let new = PreciseTime::now();
             let elapsed = cur.to(new);
-            println!("{:?} docs / hour", group_count * 3600 * 1_000_000 as u64 / (elapsed.num_microseconds().unwrap() as u64));
+            println!(
+                "{:?} docs / hour",
+                group_count * 3600 * 1_000_000 as u64
+                    / (elapsed.num_microseconds().unwrap() as u64)
+            );
             cur = new;
         }
         num_docs += 1;
@@ -129,18 +148,15 @@ fn index_documents(index_writer: &mut IndexWriter, doc_receiver: chan::Receiver<
     index_writer.commit()
 }
 
-
 enum DocumentSource {
     FromPipe,
     FromFile(PathBuf),
 }
 
 impl DocumentSource {
-    fn read(&self,) -> io::Result<BufReader<Box<Read>>> {
+    fn read(&self) -> io::Result<BufReader<Box<Read>>> {
         Ok(match self {
-            &DocumentSource::FromPipe => {
-                BufReader::new(Box::new(io::stdin()))
-            }
+            &DocumentSource::FromPipe => BufReader::new(Box::new(io::stdin())),
             &DocumentSource::FromFile(ref filepath) => {
                 let read_file = File::open(&filepath)?;
                 BufReader::new(Box::new(read_file))
diff --git a/src/commands/merge.rs b/src/commands/merge.rs
index 5ff37dc..4f313ab 100644
--- a/src/commands/merge.rs
+++ b/src/commands/merge.rs
@@ -1,13 +1,12 @@
 extern crate tantivy;
 
-use tantivy::{Index, SegmentMeta};
-use std::path::PathBuf;
 use clap::ArgMatches;
 use futures::Future;
+use std::path::PathBuf;
+use tantivy::{Index, SegmentMeta};
 
 const HEAP_SIZE: usize = 300_000_000;
 
-
 fn error_msg(err: tantivy::Error) -> String {
     format!("Merge failed : {:?}", err)
 }
@@ -15,12 +14,10 @@ fn error_msg(err: tantivy::Error) -> String {
 pub fn run_merge_cli(argmatch: &ArgMatches) -> Result<(), String> {
     let index_directory = PathBuf::from(argmatch.value_of("index").unwrap());
     run_merge(index_directory).map_err(error_msg)
-    
-    // we rollback to force a gc.
 
+    // we rollback to force a gc.
 }
 
-
 fn run_merge(path: PathBuf) -> tantivy::Result<()> {
     let index = Index::open_in_dir(&path)?;
     let segments = index.searchable_segment_ids()?;
@@ -29,7 +26,7 @@ fn run_merge(path: PathBuf) -> tantivy::Result<()> {
         .merge(&segments)?
         .wait()
         .expect("Merge failed");
-        //.map_err(|_| tantivy::Error::ErrorInThread(String::from("Merge got cancelled")));
+    //.map_err(|_| tantivy::Error::ErrorInThread(String::from("Merge got cancelled")));
     println!("Merge finished with segment meta {:?}", segment_meta);
     println!("Garbage collect irrelevant segments.");
     Index::open_in_dir(&path)?
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 71574bc..d965df7 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -1,13 +1,13 @@
-mod index;
-mod serve;
-mod new;
 mod bench;
+mod index;
 mod merge;
+mod new;
 mod search;
+mod serve;
 
-pub use self::new::run_new_cli;
-pub use self::index::run_index_cli;
-pub use self::serve::run_serve_cli;
-pub use self::search::run_search_cli;
 pub use self::bench::run_bench_cli;
+pub use self::index::run_index_cli;
 pub use self::merge::run_merge_cli;
+pub use self::new::run_new_cli;
+pub use self::search::run_search_cli;
+pub use self::serve::run_serve_cli;
diff --git a/src/commands/new.rs b/src/commands/new.rs
index 3f44a00..117c1f8 100644
--- a/src/commands/new.rs
+++ b/src/commands/new.rs
@@ -1,30 +1,35 @@
+use ansi_term::Colour::{Blue, Green, Red};
+use ansi_term::Style;
 use clap::ArgMatches;
+use serde_json;
 use std::convert::From;
+use std::io;
+use std::io::Write;
 use std::path::PathBuf;
 use tantivy;
 use tantivy::schema::Cardinality;
 use tantivy::schema::*;
 use tantivy::Index;
-use std::io;
-use ansi_term::Style;
-use ansi_term::Colour::{Red, Blue, Green};
-use std::io::Write;
-use serde_json;
-
 
 pub fn run_new_cli(matches: &ArgMatches) -> Result<(), String> {
     let index_directory = PathBuf::from(matches.value_of("index").unwrap());
-    run_new(index_directory).map_err(|e| format!("{:?}" , e))
+    run_new(index_directory).map_err(|e| format!("{:?}", e))
 }
 
-
 fn prompt_input<P: Fn(&str) -> Result<(), String>>(prompt_text: &str, predicate: P) -> String {
     loop {
-        print!("{prompt_text:<width$} ? ", prompt_text=Style::new().bold().fg(Blue).paint(prompt_text), width=40);
+        print!(
+            "{prompt_text:<width$} ? ",
+            prompt_text = Style::new().bold().fg(Blue).paint(prompt_text),
+            width = 40
+        );
         io::stdout().flush().unwrap();
         let mut buffer = String::new();
-        io::stdin().read_line(&mut buffer).ok().expect("Failed to read line");
-        let answer = buffer.trim_right().to_string();
+        io::stdin()
+            .read_line(&mut buffer)
+            .ok()
+            .expect("Failed to read line");
+        let answer = buffer.trim_end().to_string();
         match predicate(&answer) {
             Ok(()) => {
                 return answer;
@@ -36,30 +41,28 @@ fn prompt_input<P: Fn(&str) -> Result<(), String>>(prompt_text: &str, predicate:
     }
 }
 
-
 fn field_name_validate(field_name: &str) -> Result<(), String> {
     if is_valid_field_name(field_name) {
         Ok(())
-    }
-    else {
-        Err(String::from("Field name must match the pattern [_a-zA-Z0-9]+"))
+    } else {
+        Err(String::from(
+            "Field name must match the pattern [_a-zA-Z0-9]+",
+        ))
     }
 }
-    
-    
+
 fn prompt_options(msg: &str, codes: Vec<char>) -> char {
     let options_string: Vec<String> = codes.iter().map(|c| format!("{}", c)).collect();
     let options = options_string.join("/");
     let predicate = |entry: &str| {
         if entry.len() != 1 {
-            return Err(format!("Invalid input. Options are ({})", options))
+            return Err(format!("Invalid input. Options are ({})", options));
         }
         let c = entry.chars().next().unwrap().to_ascii_uppercase();
         if codes.contains(&c) {
-            return Ok(())
-        }
-        else {
-            return Err(format!("Invalid input. Options are ({})", options))
+            return Ok(());
+        } else {
+            return Err(format!("Invalid input. Options are ({})", options));
         }
     };
     let message = format!("{} ({})", msg, options);
@@ -68,30 +71,28 @@ fn prompt_options(msg: &str, codes: Vec<char>) -> char {
 }
 
 fn prompt_yn(msg: &str) -> bool {
-    prompt_options(msg, vec!('Y', 'N')) == 'Y' 
+    prompt_options(msg, vec!['Y', 'N']) == 'Y'
 }
 
-
 fn ask_add_field_text(field_name: &str, schema_builder: &mut SchemaBuilder) {
     let mut text_options = TextOptions::default();
     if prompt_yn("Should the field be stored") {
         text_options = text_options.set_stored();
     }
 
-
-
     if prompt_yn("Should the field be indexed") {
-        let mut text_indexing_options = TextFieldIndexing
-            ::default()
+        let mut text_indexing_options = TextFieldIndexing::default()
             .set_index_option(IndexRecordOption::Basic)
             .set_tokenizer("en_stem");
 
         if prompt_yn("Should the term be tokenized?") {
             if prompt_yn("Should the term frequencies (per doc) be in the index") {
                 if prompt_yn("Should the term positions (per doc) be in the index") {
-                    text_indexing_options = text_indexing_options.set_index_option(IndexRecordOption::WithFreqsAndPositions);
+                    text_indexing_options = text_indexing_options
+                        .set_index_option(IndexRecordOption::WithFreqsAndPositions);
                 } else {
-                    text_indexing_options = text_indexing_options.set_index_option(IndexRecordOption::WithFreqs);
+                    text_indexing_options =
+                        text_indexing_options.set_index_option(IndexRecordOption::WithFreqs);
                 }
             }
         } else {
@@ -101,11 +102,9 @@ fn ask_add_field_text(field_name: &str, schema_builder: &mut SchemaBuilder) {
         text_options = text_options.set_indexing_options(text_indexing_options);
     }
 
-
     schema_builder.add_text_field(field_name, text_options);
 }
 
-
 fn ask_add_field_u64(field_name: &str, schema_builder: &mut SchemaBuilder) {
     let mut u64_options = IntOptions::default();
     if prompt_yn("Should the field be stored") {
@@ -123,20 +122,28 @@ fn ask_add_field_u64(field_name: &str, schema_builder: &mut SchemaBuilder) {
 fn ask_add_field(schema_builder: &mut SchemaBuilder) {
     println!("\n\n");
     let field_name = prompt_input("New field name ", field_name_validate);
-    let text_or_integer = prompt_options("Text or unsigned 32-bit integer", vec!('T', 'I'));
-    if text_or_integer =='T' {
+    let text_or_integer = prompt_options("Text or unsigned 32-bit integer", vec!['T', 'I']);
+    if text_or_integer == 'T' {
         ask_add_field_text(&field_name, schema_builder);
-    }
-    else {
-        ask_add_field_u64(&field_name, schema_builder);        
+    } else {
+        ask_add_field_u64(&field_name, schema_builder);
     }
 }
 
 fn run_new(directory: PathBuf) -> tantivy::Result<()> {
-    println!("\n{} ", Style::new().bold().fg(Green).paint("Creating new index"));
-    println!("{} ", Style::new().bold().fg(Green).paint("Let's define it's schema!"));
+    println!(
+        "\n{} ",
+        Style::new().bold().fg(Green).paint("Creating new index")
+    );
+    println!(
+        "{} ",
+        Style::new()
+            .bold()
+            .fg(Green)
+            .paint("Let's define it's schema!")
+    );
     let mut schema_builder = SchemaBuilder::default();
-    loop  {
+    loop {
         ask_add_field(&mut schema_builder);
         if !prompt_yn("Add another field") {
             break;
@@ -148,4 +155,3 @@ fn run_new(directory: PathBuf) -> tantivy::Result<()> {
     Index::create_in_dir(&directory, schema)?;
     Ok(())
 }
-
diff --git a/src/commands/search.rs b/src/commands/search.rs
index 8bf2071..a4dfc28 100644
--- a/src/commands/search.rs
+++ b/src/commands/search.rs
@@ -1,49 +1,46 @@
 use clap::ArgMatches;
+use serde_json;
 use std::convert::From;
 use std::path::Path;
 use std::path::PathBuf;
 use tantivy;
-use tantivy::Index;
 use tantivy::query::QueryParser;
 use tantivy::schema::Field;
-use serde_json;
 use tantivy::schema::FieldType;
+use tantivy::Index;
 
 pub fn run_search_cli(matches: &ArgMatches) -> Result<(), String> {
     let index_directory = PathBuf::from(matches.value_of("index").unwrap());
     let query = matches.value_of("query").unwrap();
-    run_search(&index_directory, &query)
-        .map_err(|e| format!("{:?}", e))
+    run_search(&index_directory, &query).map_err(|e| format!("{:?}", e))
 }
 
-fn run_search(directory: &Path, query: &str) -> tantivy::Result<()> {     
+fn run_search(directory: &Path, query: &str) -> tantivy::Result<()> {
     let index = Index::open_in_dir(directory)?;
     let schema = index.schema();
     let default_fields: Vec<Field> = schema
         .fields()
         .iter()
         .enumerate()
-        .filter(
-            |&(_, ref field_entry)|
-                match *field_entry.field_type() {
-                    FieldType::Str(ref text_field_options) => {
-                        text_field_options.get_indexing_options().is_some()
-                    },
-                    _ => false
-                }
-        )
+        .filter(|&(_, ref field_entry)| match *field_entry.field_type() {
+            FieldType::Str(ref text_field_options) => {
+                text_field_options.get_indexing_options().is_some()
+            }
+            _ => false,
+        })
         .map(|(i, _)| Field(i as u32))
         .collect();
     let query_parser = QueryParser::new(schema.clone(), default_fields, index.tokenizers().clone());
     let query = query_parser.parse_query(query)?;
-    let searcher = index.searcher();
+    let searcher = index.reader()?.searcher();
     let weight = query.weight(&searcher, false)?;
     let schema = index.schema();
     for segment_reader in searcher.segment_readers() {
         let mut scorer = weight.scorer(segment_reader)?;
+        let store_reader = segment_reader.get_store_reader();
         while scorer.advance() {
             let doc_id = scorer.doc();
-            let doc = segment_reader.doc(doc_id)?;
+            let doc = store_reader.get(doc_id)?;
             let named_doc = schema.to_named_doc(&doc);
             println!("{}", serde_json::to_string(&named_doc).unwrap());
         }
diff --git a/src/commands/serve.rs b/src/commands/serve.rs
index 04f1fea..7cca7c9 100644
--- a/src/commands/serve.rs
+++ b/src/commands/serve.rs
@@ -1,8 +1,8 @@
 /// This tantivy command starts a http server (by default on port 3000)
-/// 
+///
 /// Currently the only entrypoint is /api/
 /// and it takes the following query string argument
-/// 
+///
 /// - `q=` :    your query
 ///  - `nhits`:  the number of hits that should be returned. (default to 10)   
 ///
@@ -12,16 +12,14 @@
 ///
 ///     http://localhost:3000/api/?q=fulmicoton&&nhits=20
 ///
-
-
 use clap::ArgMatches;
 use iron::mime::Mime;
 use iron::prelude::*;
 use iron::status;
-use serde_json;
 use iron::typemap::Key;
 use mount::Mount;
 use persistent::Read;
+use serde_json;
 use std::convert::From;
 use std::error::Error;
 use std::fmt::{self, Debug};
@@ -29,11 +27,7 @@ use std::path::Path;
 use std::path::PathBuf;
 use std::str::FromStr;
 use tantivy;
-use tantivy::collector;
-use tantivy::collector::CountCollector;
-use tantivy::collector::TopCollector;
-use tantivy::Document;
-use tantivy::Index;
+use tantivy::collector::{Count, TopDocs};
 use tantivy::query::QueryParser;
 use tantivy::schema::Field;
 use tantivy::schema::FieldType;
@@ -41,6 +35,9 @@ use tantivy::schema::NamedFieldDocument;
 use tantivy::schema::Schema;
 use tantivy::tokenizer::*;
 use tantivy::DocAddress;
+use tantivy::Document;
+use tantivy::Index;
+use tantivy::IndexReader;
 use timer::TimerTree;
 use urlencoded::UrlEncodedQuery;
 
@@ -52,7 +49,6 @@ pub fn run_serve_cli(matches: &ArgMatches) -> Result<(), String> {
     run_serve(index_directory, &host).map_err(|e| format!("{:?}", e))
 }
 
-
 #[derive(Serialize)]
 struct Serp {
     q: String,
@@ -68,42 +64,40 @@ struct Hit {
 }
 
 struct IndexServer {
-    index: Index,
+    reader: IndexReader,
     query_parser: QueryParser,
     schema: Schema,
 }
 
 impl IndexServer {
-    
     fn load(path: &Path) -> IndexServer {
         let index = Index::open_in_dir(path).unwrap();
-        index.tokenizers()
-            .register("commoncrawl", SimpleTokenizer
-            .filter(RemoveLongFilter::limit(40))
-            .filter(LowerCaser)
-            .filter(AlphaNumOnlyFilter)
-            .filter(Stemmer::new())
+        index.tokenizers().register(
+            "commoncrawl",
+            SimpleTokenizer
+                .filter(RemoveLongFilter::limit(40))
+                .filter(LowerCaser)
+                .filter(AlphaNumOnlyFilter)
+                .filter(Stemmer::new(Language::English)),
         );
         let schema = index.schema();
         let default_fields: Vec<Field> = schema
             .fields()
             .iter()
             .enumerate()
-            .filter(
-                |&(_, ref field_entry)| {
-                    match *field_entry.field_type() {
-                        FieldType::Str(ref text_field_options) => {
-                            text_field_options.get_indexing_options().is_some()
-                        },
-                        _ => false
-                    }
+            .filter(|&(_, ref field_entry)| match *field_entry.field_type() {
+                FieldType::Str(ref text_field_options) => {
+                    text_field_options.get_indexing_options().is_some()
                 }
-            )
+                _ => false,
+            })
             .map(|(i, _)| Field(i as u32))
             .collect();
-        let query_parser = QueryParser::new(schema.clone(), default_fields, index.tokenizers().clone());
+        let query_parser =
+            QueryParser::new(schema.clone(), default_fields, index.tokenizers().clone());
+        let reader = index.reader().unwrap();
         IndexServer {
-            index,
+            reader,
             query_parser,
             schema,
         }
@@ -115,25 +109,23 @@ impl IndexServer {
             id: doc_address.doc(),
         }
     }
-    
+
     fn search(&self, q: String, num_hits: usize) -> tantivy::Result<Serp> {
-        let query = self.query_parser.parse_query(&q).expect("Parsing the query failed");
-        let searcher = self.index.searcher();
-        let mut count_collector = CountCollector::default();
-        let mut top_collector = TopCollector::with_limit(num_hits);
+        let query = self
+            .query_parser
+            .parse_query(&q)
+            .expect("Parsing the query failed");
+        let searcher = self.reader.searcher();
         let mut timer_tree = TimerTree::default();
-        {
+        let (top_docs, num_hits) = {
             let _search_timer = timer_tree.open("search");
-            let mut chained_collector = collector::chain()
-                .push(&mut top_collector)
-                .push(&mut count_collector);
-            query.search(&searcher, &mut chained_collector)?;
-        }
+            searcher.search(&query, &(TopDocs::with_limit(num_hits), Count))?
+        };
         let hits: Vec<Hit> = {
             let _fetching_timer = timer_tree.open("fetching docs");
-            top_collector.docs()
+            top_docs
                 .iter()
-                .map(|doc_address| {
+                .map(|(_score, doc_address)| {
                     let doc: Document = searcher.doc(*doc_address).unwrap();
                     self.create_hit(&doc, doc_address)
                 })
@@ -141,7 +133,7 @@ impl IndexServer {
         };
         Ok(Serp {
             q,
-            num_hits: count_collector.count(),
+            num_hits,
             hits,
             timings: timer_tree,
         })
@@ -162,42 +154,53 @@ impl fmt::Display for StringError {
 }
 
 impl Error for StringError {
-    fn description(&self) -> &str { &*self.0 }
+    fn description(&self) -> &str {
+        &*self.0
+    }
 }
 
 fn search(req: &mut Request) -> IronResult<Response> {
     let index_server = req.get::<Read<IndexServer>>().unwrap();
     req.get_ref::<UrlEncodedQuery>()
-        .map_err(|_| IronError::new(StringError(String::from("Failed to decode error")), status::BadRequest))
+        .map_err(|_| {
+            IronError::new(
+                StringError(String::from("Failed to decode error")),
+                status::BadRequest,
+            )
+        })
         .and_then(|ref qs_map| {
             let num_hits: usize = qs_map
                 .get("nhits")
                 .and_then(|nhits_str| usize::from_str(&nhits_str[0]).ok())
                 .unwrap_or(10);
-            let query = qs_map
-                .get("q")
-                .ok_or_else(|| IronError::new(StringError(String::from("Parameter q is missing from the query")), status::BadRequest))?[0].clone();
+            let query = qs_map.get("q").ok_or_else(|| {
+                IronError::new(
+                    StringError(String::from("Parameter q is missing from the query")),
+                    status::BadRequest,
+                )
+            })?[0]
+                .clone();
             let serp = index_server.search(query, num_hits).unwrap();
             let resp_json = serde_json::to_string_pretty(&serp).unwrap();
             let content_type = "application/json".parse::<Mime>().unwrap();
-            Ok(Response::with((content_type, status::Ok, format!("{}", resp_json))))
+            Ok(Response::with((
+                content_type,
+                status::Ok,
+                format!("{}", resp_json),
+            )))
         })
-        
 }
 
-
-
 fn run_serve(directory: PathBuf, host: &str) -> tantivy::Result<()> {
     let mut mount = Mount::new();
     let server = IndexServer::load(&directory);
-    
+
     mount.mount("/api", search);
-    
+
     let mut middleware = Chain::new(mount);
     middleware.link(Read::<IndexServer>::both(server));
-    
+
     println!("listening on http://{}", host);
     Iron::new(middleware).http(host).unwrap();
     Ok(())
 }
-
diff --git a/src/main.rs b/src/main.rs
index 76ae711..cdf0174 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,41 +3,39 @@ extern crate clap;
 extern crate serde_json;
 #[macro_use]
 extern crate log;
+extern crate ansi_term;
+extern crate bincode;
+extern crate byteorder;
+extern crate chan;
 extern crate env_logger;
-extern crate tantivy;
-extern crate time;
-extern crate persistent;
 extern crate futures;
-extern crate urlencoded;
 extern crate iron;
-extern crate chan;
-extern crate staticfile;
-extern crate ansi_term;
 extern crate mount;
-extern crate bincode;
-extern crate byteorder;
+extern crate persistent;
+extern crate staticfile;
+extern crate tantivy;
+extern crate time;
+extern crate urlencoded;
 
 #[macro_use]
 extern crate serde_derive;
 
 use std::io::Write;
 
-use clap::{AppSettings, Arg, App, SubCommand};
+use clap::{App, AppSettings, Arg, SubCommand};
 mod commands;
 pub mod timer;
 use self::commands::*;
 
-
 fn main() {
-    
     env_logger::init().unwrap();
-    
+
     let index_arg = Arg::with_name("index")
-                    .short("i")
-                    .long("index")
-                    .value_name("directory")
-                    .help("Tantivy index directory filepath")
-                    .required(true);
+        .short("i")
+        .long("index")
+        .value_name("directory")
+        .help("Tantivy index directory filepath")
+        .required(true);
 
     let cli_options = App::new("Tantivy")
         .setting(AppSettings::SubcommandRequiredElseHelp)
@@ -135,7 +133,7 @@ fn main() {
         "search" => run_search_cli,
         "merge" => run_merge_cli,
         "bench" => run_bench_cli,
-        _ => panic!("Subcommand {} is unknown", subcommand)
+        _ => panic!("Subcommand {} is unknown", subcommand),
     };
 
     if let Err(ref e) = run_cli(options) {
diff --git a/src/timer.rs b/src/timer.rs
index 9563810..fd480d3 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -26,7 +26,8 @@ impl<'a> Drop for OpenTimer<'a> {
     fn drop(&mut self) {
         self.timer_tree.timings.push(Timing {
             name: self.name,
-            duration: self.start
+            duration: self
+                .start
                 .to(PreciseTime::now())
                 .num_microseconds()
                 .unwrap(),