Add tests for dynamic update of student training examples based on rubric changes.
Use dependency injection for event notification; moved some classes around.
Move the container JS classes into the Studio minified JS.
Fix a bug that broke student training updates in Firefox and PhantomJS.
Move fixture path installation into a common file shared by all tests.

Add tests that verify the correct notifications
are sent by the rubric view.
Merge pull request #538 from edx/will/student-training-refactor-and-tests

Student training dynamic update refactor and tests