puts inline annotations behind a feature flag

this was to test cost in terms of compilation speed. doesn't seem like a
big deal but leaving it in case it is later.

Cargo.toml

@@ -37,6 +37,7 @@ money = { path = "../money", version = "0.2" }
 pubsub = { path = "../pubsub" }
 
 [features]
+default = ["inlines"]
 no-thrash = []
 trace = []
 debug = []
@@ -48,3 +49,4 @@ scholes = []
 no-influx-buffer = []
 disable-short-uuid = []
 warnings = []
+inlines = []

src/influx.rs

@@ -199,18 +199,18 @@ impl Clone for InfluxWriter {
 impl InfluxWriter {
     /// Sends the `OwnedMeasurement` to the serialization thread. 
     /// 
-    #[inline]
+    #[cfg_attr(feature = "inlines", inline)]
     pub fn send(&self, m: OwnedMeasurement) -> Result<(), SendError<Option<OwnedMeasurement>>> {
         self.tx.send(Some(m))
     }
 
-    #[inline]
+    #[cfg_attr(feature = "inlines", inline)]
     pub fn nanos(&self, d: DateTime<Utc>) -> i64 { nanos(d) as i64 }
 
-    #[inline]
+    #[cfg_attr(feature = "inlines", inline)]
     pub fn dur_nanos(&self, d: Duration) -> i64 { dur_nanos(d) as i64 }
 
-    #[inline]
+    #[cfg_attr(feature = "inlines", inline)]
     pub fn dur_nanos_u64(&self, d: Duration) -> u64 { dur_nanos(d).max(0) as u64 }
 
     pub fn tx(&self) -> Sender<Option<OwnedMeasurement>> {