[CoreBundle] Add some data to Symfony WebProfiler toolbar

First it was like:

![](http://cdn.memegenerator.net/instances/400x/33936742.jpg)

And that's the result =)

![toolbar](https://cloud.githubusercontent.com/assets/67402/2780311/06083bdc-cb06-11e3-87d6-a2f422e9c51e.png)