Enable reordering on the unit page

Feature/cdodge/subsection edit page

add subsection edit page to the project with a shared 'unit' widget that will render out unit lists. Both edit_subsection and overview.html will share this widget

add subsection edit page to the project with a shared 'unit' widget that will render out unit lists. Both edit_subsection and overview.html will share this widget

Merge branch 'feature/cale/cms-master' of github.com:MITx/mitx into feature/cdodge/subsection-edit-page

code mirror styling and a few small tweaks

Feature/cdodge/asset id change

for get_all_content_info_for_course(), return a list of the MongoDB query rather than a cursor object. Also add some documentation (in a comment) as to what a caller should expect

use better encapsulation for the naming convention behind thumbnails. Put it all in content.py rather than view.py.

refactor StaticContent id scheme to be the same as moduledata. Also expose a new 'get all content for course' which will be needed to support a asset management page.

allow 'is_staff' flagged user accounts to run as super-admin, which mean...

private/public unit

fix bug with editing HTML. The save() method should now return a diction...

Conflicts:
	cms/djangoapps/contentstore/views.py

always load in a new instance of the edit module. It appeared as though ...

in order to avoid using stale modules when editing, clear out the @module variable after a save(). Then on a subsequent edit, it'll get recreated

always load in a new instance of the edit module. It appeared as though on multiple edits (w/o refreshing page) without creating a new data model, we were always referencing stale content from the previous edit

Feature/cale/cms codemirror background

Feature/cale/cms new component ids

Feature/cdodge/cms permissions management

Feature/cale/cms tom wireframe