A way to await on the output of either of two futures
Example
use future;
use ;
let out = either.await;
assert_eq!;
let out = either.await;
assert_eq!;
License
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.