Creates a global index of colors
Alters the shape and color of buttons in the header

+ Makes the mode buttons invert on hover/focus
+ Changes the alert, refresh, logout, and help icons to a square format
Brings colors more in-line with the 8shapes visual index
Ties text body size and colors to 8shapes visual index
Changes background color of developer bar to smalt
Merge pull request #822 from sonatype/8shapes_colors

8shapes colors