Reformat JS
Reorganize URLs and views around course team

Match other views better, saner URLs, more RESTful style, extensible for other roles
Add button to add/remove instructor priviledges on course team page
Removed `get_url_reverse` function

It was causing unit tests to fail, and it's a needless bit of abstraction that
never should have existed in the first place.
Update a manage_user reverse call
Fixing test failures
Make assertion failure message more understandable