Added Icons, and reorganization of graphics folder.

I've added icons so users can have the os icons and identify between .styl files and .css or .min.css

![1-15-2014 11-31-22 am](https://f.cloud.github.com/assets/332079/1925657/182e75f6-7e35-11e3-976b-86cd34f7af3e.png)


Greetings.