Kf multicourse design

Rearranged more images, made some smaller, made some slight changes to the design on the homepage and made all edX proper case

Don't start the rss feed with a blank line, as that causes some versions...

Dormsbee/copy edits 1

Add month names

Mm more copy

Keep courses and front page from erroring when we're missing an org in data

University profile caching and csrf cookie. Course about page caching.

university_profile didn't have the ensure_csrf_cookie decorator. course_about and university_profile didn't have the cache_if_anonymous decorator.

Mm copy