Rename rfc7230 to http to more clearly indicate its purpose.

src/server/request.rs

@@ -10,8 +10,8 @@ use version::{HttpVersion};
 use method;
 use header::Headers;
 use header::common::ContentLength;
-use rfc7230::{read_request_line};
-use rfc7230::{HttpReader, SizedReader, ChunkedReader};
+use http::{read_request_line};
+use http::{HttpReader, SizedReader, ChunkedReader};
 use net::NetworkStream;
 use uri::RequestUri;