[FEATURE] Profiler extension for sulu

- Show contextual information about current request

- [ ] test coverage
- [ ] gather feedback for my changes

![untitled](https://cloud.githubusercontent.com/assets/530801/3993493/705be9a6-290d-11e4-8b0f-eeb404b32dfb.png)

__Depends__

- https://github.com/sulu-cmf/sulu/pull/204

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | 
| Fixed tickets | 
| BC Breaks     | 
| Doc           |