Switch from tabbed Visual/HTML Editor for HTML modules to showing the code editor as a plugin within TinyMCE (triggered from toolbar). STUD-1422

Changed menu name for consistency, but we don't show it.

It can get left behind in style blocks.

Needed to switch static links back and forth.

js changes to support new tinymce
scss changes for alignments

Adding ability to give an attribute callback for CAS

Catch module render exceptions

Commenting out flaky acceptance tests.

Fix a url processing error in 02_html5_video.js

Commenting out a flaky acceptance test.

As the code in this .js will break the url's integrity when there is already a query string inside the video source's url and cause the url to be invalid in some cases (for example, when working with a url from Windows Azure's Media Service, the appended '?' will cause the url being invalid).
I modified the code by first checking whether the url has already had a query string, and if so, then use '&' instead of '?' to prevent the breaking, and it works for the url from Windows Azure's Media Service.

Fix incorrect parse of url in video_module.py