then/promise — pull request #35 by chrissrogers (2014-04-03 01:02:09+00:00)
Title: Allows an inheriting constructor to return itself when calling .then

given
```js
function Awesome(fn) {
if (!(this instanceof Awesome)) return new Awesome(fn)
Promise.call(this, fn)
}
Awesome.prototype = Object.create(Promise.prototype)
Awesome.prototype.constructor = Awesome
```

previously...
```js
var awesome = new Awesome(function () {})
awesome.then(function () {})
// => Promise
```

now...
```js
var awesome = new Awesome(function () {})
awesome.then(function () {})
// => Awesome
```