A simple gitlab theme for gitbucket

I was just playing with the plugin examples and came to the idea that i could be simple to implement theme with it. So i make one similar to gitlab. 
It still need work to be perfect on all browser and to come more closer to the gitlab appareance.

Exemple :
![capture2](https://cloud.githubusercontent.com/assets/4052400/5239446/2b2810c4-78e2-11e4-8c7d-549dd815f56c.png)


.