Removed rustc-serialization as a dependency.

Author: TheServerAsterisk

src/integrations/mod.rs

@@ -1,3 +1,2 @@
 #[cfg(feature="iron-handlers")] pub mod iron_handlers;
-#[cfg(feature="rustc-serialize")] pub mod rustc_serialize;
-#[cfg(feature="serde")] pub mod serde;
+pub mod serde;