feat(hyper): switch to std::io, std::net, and std::path.

All instances of `old_io` and `old_path` were switched to use the new
shiny `std::io`, `std::net`, and `std::path` modules. This means that
`Request` and `Response` implement `Read` and `Write` now.

Because of the changes to `TcpListener`, this also takes the opportunity
to correct the method usage of `Server`. As with other
languages/frameworks, the server is first created with a handler, and
then a host/port is passed to a `listen` method. This reverses what
`Server` used to do.

Closes #347

BREAKING CHANGE: Check the docs. Everything was touched.

examples/client.rs

@@ -1,9 +1,7 @@
-#![feature(env, old_io)]
+#![feature(env)]
 extern crate hyper;
 
 use std::env;
-use std::old_io::stdout;
-use std::old_io::util::copy;
 
 use hyper::Client;
 
@@ -18,16 +16,12 @@ fn main() {
 
     let mut client = Client::new();
 
-    let mut res = match client.get(&*url).send() {
+    let res = match client.get(&*url).send() {
         Ok(res) => res,
         Err(err) => panic!("Failed to connect: {:?}", err)
     };
 
     println!("Response: {}", res.status);
     println!("Headers:\n{}", res.headers);
-    match copy(&mut res, &mut stdout()) {
-        Ok(..) => (),
-        Err(e) => panic!("Stream failure: {:?}", e)
-    };
-
+    //TODO: add copy back when std::stdio impls std::io::Write.
 }