/*
* @overview es6-promise - a tiny implementation of Promises/A+.
* @copyright Copyright (c) 2014 Yehuda Katz, Tom Dale, Stefan Penner and contributors (Conversion to ES6 API by Jake Archibald)
* @license   Licensed under MIT license
*            See https://raw.githubusercontent.com/jakearchibald/es6-promise/master/LICENSE
* @version   2.3.0
*/