Merge pull request #529 from edx/grady/rubric-validation-event-handler

Validation and Dynamic Updates of Training Examples
Fixes the Bleed through of the Submission box Resize Handle by increasing the Z score of the modal which it was bleeding through.
Un highlight invalidated example options on edit
Merge branch 'authoring' of https://github.com/edx/edx-ora2 into grady/fix-resize-bleed-through

Conflicts:
	openassessment/xblock/static/css/openassessment.css
Merge pull request #537 from edx/sanchez/unhighlight-selected-options

Un highlight invalidated example options on edit
Merge pull request #533 from edx/grady/fix-resize-bleed-through

Grady/fix resize bleed through
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.