[fix] Also ignore virtualenv and graph representations
[fix] Thread has now a name and no longer a subject
[fix] Solving double inheritance issues and adapting tests
[enh] Documentation + fasten *Leaf.childrens()
[fix] Adapting to the fixed Leaf object
[enh] Extending the graphviz command with more colors
Merge branch 'master' of https://github.com/C4ptainCrunch/beta402
[fix] Adapting document viewer to WhiteBoard arch
[fix] A course shows its documents
[fix] Adapting document viewer initialisation
[enh] decreasing global font size
[fix] Always encode DB strings to utf-8
Merge branch 'master' of git://github.com/titouanc/beta402

Conflicts:
	documents/urls.py
	documents/views.py
	graph/views.py
	static/scripts/viewer.js
	templates/viewer.html