v0.0.1

First release that contains a basic version of the image processing layer.
There are still a lot of pending work to do: [v0.0.2].
Here are the fixed issues: https://github.com/ngryman/ribs/issues?milestone=1&page=1&state=closed

For now there are 4 operations:
 - decode
 - encode
 - resize
 - crop

Each one of those operations is implemented in `c++` and wrapped by a JavaScript's function.
Those functions are always `async` and have the same signature: `(params, image, next)`.
For now, the `Pipeline` object helps to enqueue several operations. Later it will be used by *ribs* fronted like the one described in the API wiki page.

Each one of those operations, and the `Pipeline` are covered by acceptance tests.

[v0.0.2]: https://github.com/ngryman/ribs/issues?milestone=2&state=open