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 22 35 pm](https://cloud.githubusercontent.com/assets/186715/4777216/4a2baa22-5bcc-11e4-80ba-2fb70ab359d5.png)