always load in a new instance of the edit module. It appeared as though on multiple edits (w/o refreshing page) without creating a new data model, we were always referencing stale content from the previous edit

Feature/cale/cms codemirror background

Feature/cale/cms new component ids

Feature/cale/cms tom wireframe

Make overview page conform to section/subsection/unit format. Breaks CMS editing of existing courses

Move common scss mixins to common/static/sass, and tweak the video player to have more in common between the cms and the lms

fixed custom tab box-sizing glitch in firefox