feat(lib): use serge instead of serialize

However, for some reason, the `Serialize/Deserialize` macros don't work
for me, even though they work just fine in the respective tests of
the serge crate. What am I possibly doing wrong ?

src/rust/cmn.rs

@@ -43,7 +43,7 @@ impl<T: Seek + Read> ReadSeek for T {}
 
 
 /// A utility type which can decode a server response that indicates error
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct JsonServerError {
     error: String,
     error_description: Option<String>

src/rust/lib.rs

@@ -1,10 +1,11 @@
-#![feature(core,io,old_path)]
+#![feature(core,io,old_path, custom_derive, plugin)]
 #![allow(dead_code, deprecated, unused_features)]
 //! library with code shared by all generated implementations
+#![plugin(serde_macros)]
 extern crate hyper;
 extern crate mime;
-extern crate "rustc-serialize" as rustc_serialize;
 extern crate "yup-oauth2" as oauth2;
+extern crate serde;
 
 // just pull it in the check if it compiles
 mod cmn;