style cleanup for open ended assessments, cleaning up workflow header, style definitions for rubrics are commented out momentarily, and an open issue for unicode rendering on the show and hide prompt area still remains

cleaned up sass document format and added baseline variable throughout capa and combined open ended problems. no style rule changes, simply whitespace, ordering of properties, and the addition of baseline over direct pixels for padding and margins.

override .sr class from keeping tooltips hidden in sequence nav

Blank common and advanced problems now display an inline score of "0 points" upon creation

Embedded discussion component defaults to "Discussion"
Blank HTML page defaults to "Text"
Video component defaults to "Video"

These default names show up in tooltips.

Update diff-cover to latest version

Make cms.dev environment work with manage.py