MDN
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise
ECMAScript 2015 Language Spec
http://www.ecma-international.org/ecma-262/6.0/
Promises/A+
AVA Assertions
MDN
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise
ECMAScript 2015 Language Spec
http://www.ecma-international.org/ecma-262/6.0/
Promises/A+
AVA Assertions