Matched stats colors from WordPress.com

Fixes #1226 

Before and After
![issue1226](https://f.cloud.github.com/assets/373903/2259608/0d58f8b4-9e37-11e3-9576-2adabd022c78.png)

WordPress.com example:

![2014-02-25_09-38-05](https://f.cloud.github.com/assets/373903/2259613/20f976be-9e37-11e3-82a0-c17ff3dde29a.png)