Updated color palette for white backgrounds.

An updated color palette that looks great on white backgrounds.

![screen shot 2014-06-10 at 5 18 10 pm](https://cloud.githubusercontent.com/assets/220979/3237145/c8a722e4-f0e4-11e3-8cf7-cae19da20a74.png)

Fixes https://github.com/visionmedia/debug/issues/112