Added some design changes to the homepage header

Consolidate javascript at the bottom of the page and in a minimal number of django-pipeline groups

Sort by course number. Simplify university grouping.

Javascript slim

Removed a bunch of non-necessary javascript from homepage. Most of it was put back in courseware. A new PIPELINE_JS group 'courseware' was created, for pipeline javascript files that should only be in the courseware.

Dormsbee/change reg fields

Added a favicon.

Smooth registration

Unenroll

Dormsbee/copy edits 3

Cleaned up activation pages. Added "Log In" link to notice when anonymous user tries to enroll in course.

Fortunately, the migrations that were lost won't mess things up. One
is a modification of country, which we're dropping anyway. Another
affects location, which is fine to leave as it was.