extra::net::url has moved to extra::url. No more 0.7 compatibility.

extra::net was removed in rust-lang/rust#7883,
and so extra::net::url was moved to extra::url.

Author: chris-morgan

src/librusthttpserver/request.rs

@@ -1,5 +1,5 @@
 use extra::treemap::TreeMap;
-use extra::net::url::Url;
+use extra::url::Url;
 use super::method::{Method, Options};
 use super::status;
 use std::rt::io::net::tcp::TcpStream;