issue/11 Dynamically compile in the version number using the version crate

Cargo.lock

@@ -17,6 +17,7 @@ dependencies = [
  "tantivy 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "urlencoded 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -773,6 +774,11 @@ name = "vec_map"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "version"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -876,5 +882,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
 "checksum uuid 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "78c590b5bd79ed10aad8fb75f078a59d8db445af6c743e55c4a53227fc01c13f"
 "checksum vec_map 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cac5efe5cb0fa14ec2f84f83c701c562ee63f6dcc680861b21d65c682adfb05f"
+"checksum version 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4c941215489baf638156fcc85c59a45444709a7ac2093b9b22b45e3cfe80fe26"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"

Cargo.toml

@@ -29,6 +29,7 @@ byteorder = "0.5"
 log = "0.3"
 env_logger = "0.3"
 tantivy = "0.2.0"
+version = "2"
 
 [[bin]]
 name = "tantivy"

src/main.rs

@@ -1,6 +1,8 @@
 #[macro_use]
 extern crate clap;
 #[macro_use]
+extern crate version;
+#[macro_use]
 extern crate rustc_serialize;
 #[macro_use]
 extern crate log;
@@ -35,7 +37,7 @@ fn main() {
 
     let cli_options = App::new("Tantivy")
         .setting(AppSettings::SubcommandRequiredElseHelp)
-        .version("0.1")
+        .version(version!())
         .author("Paul Masurel <paul.masurel@gmail.com>")
         .about("Tantivy Search Engine's command line interface.")
         .subcommand(