8shapes colors

Creates a new color/font index based on the 8shapes visual index. Makes the mode toggles invert on hover/focus. Gives the rest of the header buttons a square, full-height outline on hover (the same as the mode buttons).

Before:
![screen shot 2014-10-24 at 3 14 09 pm](https://cloud.githubusercontent.com/assets/186715/4777151/26177446-5bcb-11e4-9248-ae6c2fc52805.png)

After:
![screen shot 2014-10-24 at 3 07 33 pm](https://cloud.githubusercontent.com/assets/186715/4777097/500e42b2-5bca-11e4-8a56-95335ad75a15.png)