new mixin, indent improvements

-moz-box-shadow is not needed the mixin is copied from twitter bootrap, i indented some stuff, especially the "Button icon and color" block.

I also moved the &:before stuff to the beginning of the "Button icon and color" this is helpful if people using editors with block selection can easy cur if the rest of the lines if they want create another more simple style, like monochrome without all the extra font colors, text-shadows or use the colors only on hover not by default ... this is what i intend to do now.

I hope you like it.