Add SASS to CSS

A lot of developers using SASS or LESS in your job. The bootstrap uses too.

I adapted the original CSS using SASS/Compass functions. In this way is more easy integrate the plugin in your own stylesheet.

And the maintain is more simple. If the developer would change the colors of outline, or style or anything is a lot minor work.

To use SASS in project just install [SASS](http://sass-lang.com/install) and [Compass](http://compass-style.org/install/) and run `compass compile` from root.

I'll hope it's be useful for everything.