Diff of JavaScript/Promise

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- https://www.promisejs.org/

- あなたが読むべきJavaScript Promises
--  http://jser.info/post/77696682011/es6-promises

- [WIP] JavaScript Promiseの本
--  http://azu.github.io/promises-book/
// --  http://htmlpreview.github.io/?https://github.com/azu/promises-book/blob/preview-html/390.1.html#promises-overview