Flat buttons, new colors and fixed bugs

Now Generation (which is at version 1.1) supports a new kind of button: the flat button. After doing some changes at button's shadow's code, a flat button looks like a great idea: a button without default shadow (elevation): the only shadow that it have is when it's hovered. The class it's named flat-button and can be placed everywhere when a button it's expected.

Adding to this, the button-group class now adds a default fx-1 class to it's children until the non-automatic-flexible it's added too.

The natural color pallete was added to Generation 1.1 and there is working on a new color pallete based on most design's colors (Flat Design + Google's Material Design + Some others).

You can download the lastest version of Generation in GitHub alinarezrangel/generation