Remove the Reactor::run method (#58)

This commit removes the `Reactor::run` method which has previously been used to
execute futures and turn the reactor at the same time. The tests/examples made
heavy usage of this method but they have now all temporarily moved to `wait()`
until the futures dependency is upgraded. In the meantime this'll allow us to
further trim down the `Reactor` APIs to their final state.

examples/hello.rs

@@ -19,17 +19,17 @@ extern crate tokio_io;
 use std::env;
 use std::net::SocketAddr;
 
-use futures::stream::Stream;
-use tokio::reactor::Reactor;
+use futures::prelude::*;
 use tokio::net::TcpListener;
+use tokio::reactor::Handle;
 
 fn main() {
     env_logger::init().unwrap();
     let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
     let addr = addr.parse::<SocketAddr>().unwrap();
 
-    let mut core = Reactor::new().unwrap();
-    let listener = TcpListener::bind(&addr, &core.handle()).unwrap();
+    let handle = Handle::default();
+    let listener = TcpListener::bind(&addr, &handle).unwrap();
 
     let addr = listener.local_addr().unwrap();
     println!("Listening for connections on {}", addr);
@@ -42,5 +42,5 @@ fn main() {
         Ok(())
     });
 
-    core.run(server).unwrap();
+    server.wait().unwrap();
 }