8200 graphical representation of the projects work package

The task is not finished yet, the PR is just to show how it could look.
Bower has downloaded the CSS of nvd3, but include doesn't work, so I did it manually.
![screenshot from 2014-05-29 18 39 11](https://cloud.githubusercontent.com/assets/4527590/3120326/cbb5c9fc-e74f-11e3-942d-0b7b3acfcd9f.png)