[whiteboard] Show related documents in a course
[whiteboard][fix] set thread name at creation
[whiteboard] show thread name in thread.html
[whiteboard] fix viewer
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
[enh] toogle navbar only when clicking on course, not the whole menu
[fix] When document name is too large, viewer controls disappear
[enh] Redefining zoom by percentage