Updated statistics app. Added course statistics.
Added tests for helpers
Split courses.tests in individual files.
Makes it easier to extend tests.
Added more courses tests.1
Separated faq and forum tests.
Added division_by_zero test for statistics
Fixed failing tests in courses.tests
Template style fixes and query optimization in students
Split website.tests
Added more statistics views tests.
Fixed failing test in courses.test_models.py
Fixed failing tests
Attemp to fix failing test in forums.test_views
Split students.tests
Fix a forum.test
Merge branch 'add_statistics'

Conflicts:
	statistics/views.py