NEW: Doxygen theme refresh

I just want to get feedback from the community before merging that in:

![screen shot 2014-02-17 at 15 05 45](https://f.cloud.github.com/assets/208711/2190461/fa1cb992-9829-11e3-8995-30fc8097bf68.png)

![screen shot 2014-02-17 at 15 05 09](https://f.cloud.github.com/assets/208711/2190460/f3eae1fc-9829-11e3-934c-ac32d690c1c7.png)