Should rework how inline threads are expanded/collapsed a little so that this kind of
thing is not needed.

Currently there's a bug where editing more than once without reloading the page
causes it to successively get more and more broken.

use subviews for rendering. Functionality should be the same. Changed a few things
in DiscussionThreadView to make this a little easier.

Fix staff markers for inline threads and double staff markers for threads with deeply nested comments.

Extra spaces actually get added to a post when activating a WMD editor which can
get saved into the post if you click update.

Merge branch 'feature/arjun/new-discussions' of github.com:MITx/mitx into feature/arjun/new-discussions

Conflicts:
	lms/djangoapps/django_comment_client/forum/views.py
	lms/static/sass/_discussion.scss

loaded into the page in a data attribute instead of loaded on request via ajax.
The user profile page also does not provide facilities for adding
comments/responses, which I think would clutter the page too much.

Also removed some unused stuff from views.py.

Kill requests for loading responses when selecting another thread. This ensures that the thread you're viewing has the right responses loaded.