The help tab opens a modal dialog that directs the user at various resources
(e.g. the site FAQ and course forums) and allows the user to submit feedback
to the feedback endpoint (which will ultimately create a ticket for the
student support team).

blocked from courseware pages, if course hasn't started yet)

Conflicts:
	lms/djangoapps/courseware/views.py
	lms/templates/courseware/course_navigation.html

#224

#224