Added pie chart for breakdown based on d3.

That was easy!
Added hover animation
Fixed graph size
Added jquery ui
Added directories for compiled files to .gitignore
Implemented a jquery ui widget for the breakdown graph

Conflicts:
	src/Classroom/ProjectBundle/Resources/views/Project/feed.html.twig
Added update animation
Fixed widget for new data structure and added some styles
Added breakdown chart twig extension

This extension will convert breakdown data from the entity into json
encoded chart data, needed by the javascript.
Moved breakdown chart from feed to overview

and implemented the new twig extension to get the needed data structure.

Conflicts:
	src/Classroom/ProjectBundle/Resources/views/Project/feed.html.twig
Merge pull request #6 from micha149/feature/breakdown-chart

Added a breakdown chart to overview page