Merge pull request #3 from webnard/master

Converts video thumbs to JPGs instead of PNGs and changes references.
Modifying annotation resource to allow anyone access to the annotations.
Read access for a collection cascades to videos in that collection.
Merge pull request #5 from webnard/ta-read-access

Read access for a collection cascades to videos in that collection.
Added additional programs allowed for course associations.
Made the default coverage for annotations to be public.
Videos behind auth wall now.
Video files won't play unless given the correct referrer header.
Merge pull request #6 from webnard/feature/video-auth

Videos require authorization in order to watch
Adding requirements.txt file for use with pip.