Feature/material design reol 72

I call bullshit on that article. Colors are defined by the standard: http://dev.w3.org/csswg/css-color/#named-colors
They're not going to change.

In any case, most of the color definitions shouldn't be hex values anyway, but SCSS variables. But it seems a bit overkill to define $white. "white" is more readable than #fff (and they're supposed to be lowercase).