Prevent queries into split using deprecated CourseLocators, BlockUsageLocators, or DefinitionLocators

Make Studio CoursePage objects generate the correct CourseLocator based on whether the DEFAULT_STORE is set or not

Automatically log in users who access third party login after trying to register for a course

Add Django apps for student account and profile

Add Python APIs for account/profile information to user_api
Updating profile page to have social linking

Authors: Renzo Lucioni, Alasdair Swan, Stephen Sanchez, Will Daly

Change the topic of a previously posted post.

Wrap studio views in bulk operations to minimize mongo calls.

Pass _get_course_module() depth param down into modulestore get_course() instead of hard-coded zero.

Use strings instead of tuples as keys in SessionKeyValueStore.

Making the django main template navigation course aware.

Course admin should be able to de-admin dicussion admins

Some Django packages expect only strings as keys in the user session,
and it is also a recommended practice in the Django manual.

As a global staff or course staff once you added yourself
in the discussion admins you cannot revoke it back unless
you remove yourself as course staff. Any of the course staff
member should be able to remove others from discussion admins
whether they are course staff or not.

TNL-315

Fixes check for Image Annotation Tool to include ID from image server and fix scrolling bug

Alasdair/header footer accessibility updates