Lightbox2 in SCSS

Because i think that there are many other developers using scss, like me, i've rewritten lightbox into scss. I think it can be handy.

It is using few compass mixins, silent classes and it's basically adjustable by variables.

Also I'm using data:images than standart images for minimizing http requests. This feature is optional and switchable with true/false switch on top of `lightbox.scss` file. By default it include data:images. If you will set it to `false`, (or delete whole logic block) it will include paths for standart images.