Debug panel UI improvements

See the commit messages for a description. Works also nicer for smaller devices, see screenshots.

### UI Updates
![bildschirmfoto 2014-11-19 um 17 25 14](https://cloud.githubusercontent.com/assets/649031/5109517/05423278-7012-11e4-9c50-e2da18c3be1a.png)

### Mobile View
![bildschirmfoto 2014-11-19 um 17 28 05](https://cloud.githubusercontent.com/assets/649031/5109518/0545ad5e-7012-11e4-8009-26a716dd1f40.png)