Revert "refactor(lib): convert to futures 0.2.0-beta (#1470)"

This reverts commit a12f7beed9.

Much sadness 😢.

examples/server.rs

@@ -4,7 +4,7 @@ extern crate hyper;
 extern crate pretty_env_logger;
 extern crate tokio;
 
-use futures::FutureExt;
+use futures::Future;
 use futures::future::{FutureResult, lazy};
 
 use hyper::{Body, Method, Request, Response, StatusCode};
@@ -43,11 +43,9 @@ fn main() {
     pretty_env_logger::init();
     let addr = "127.0.0.1:1337".parse().unwrap();
 
-    tokio::runtime::run2(lazy(move |_| {
+    tokio::run(lazy(move || {
         let server = Http::new().bind(&addr, || Ok(Echo)).unwrap();
-        println!("Listening on http://{}", server.local_addr().unwrap());
-        server.run().recover(|err| {
-            eprintln!("Server error {}", err)
-        })
+        println!("Listening on http://{} with 1 thread.", server.local_addr().unwrap());
+        server.run().map_err(|err| eprintln!("Server error {}", err))
     }));
 }