Using the improved course graph in admin side as well
Use course graphs in student's curriculum views
Use arrows in graph view
Fixing 'remove competence from plan' functionality
Merge branch 'student' of github.com:tsauvine/o4 into student

Conflicts:
	app/assets/javascripts/libs/graph/graphView.js.coffee
	app/assets/stylesheets/default.scss
	app/views/curriculums/competences/graph.html.erb
	app/views/curriculums/competences/show.html.erb
	app/views/curriculums/courses/graph.html.erb
	app/views/curriculums/courses/show.html.erb
	app/views/plans/competences/delete.html.erb
	app/views/plans/courses/show.html.erb