RESTful api for getting course listing and opening course in studio.

Pattern for how to do refactoring from locations to locators and from
old style urls to restful ones.
Tests for Locator <-> Location help functions
Ensure bootstrapping tests start w/ clean slate.
Remove IDE-specific placeholder from before we had manage.pyUse manage.py instead (with cms --settings dev runserver --noreload --traceback 8001)
Test the new RESTful course index and outline views.
More restful changes
More locator <-> location tests