defer

*A lightweighted promise library follow Promise / A+ standards.

I think if you want to build your own promise, the main part is to maintain a state machine, you should know how to transform state between pending, fulfilled and rejected.

Promise standard:

Promise/A+

Reference:

H5 rocks promise tutorials(http://www.html5rocks.com/en/tutorials/es6/promises/)

Open source Promise/A+ standard(https://promisesaplus.com/)

ECMAScript language specification ECMA-262 6th edition promise part(http://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise-objects).

Realize step:

How to realize resolve, reject, then base on https://github.com/promises-aplus/promises-spec

Features that the library contains:

```
parallel promise
```

Support:

Both Browser and Node.js environment.

To do...

I will use mocha to write some case later.