Buttonfun and spinner

I added a `.working` class (heh) for buttons, added classes for button states without the `btn-` prefix (so `btn success` works just like `btn btn-success`.

Also animated spinning fontawesome icons.

![screen shot 2014-02-13 at 10 50 35 am](https://f.cloud.github.com/assets/77472/2161439/a9ce0bd2-94c6-11e3-9fef-16a6800ad6c0.png)