Use Backbone notifications for course section delete.
Use Backbone notifications for component delete.
Use Backbone notifications for setting graded status.
Factor out common code between module editing and course overview.
Studio: changed the copy and prompt type for unit + outline deletions
Remove `@xhr.restore()` to fix tests.
Remove commented-out code and add test.
Merge pull request #415 from edx/peter-fogg/notification-stories

Peter fogg/notification stories