Ahodges/video upload

Initial draft of the "Processing Video Files" guide for consortium members describes the procedures needed to get an institution up and running (video_prereqs.rst) and for course teams to upload video files (video_uploads.rst).
An HTML version is available at http://draft-processing-video-files.readthedocs.org/en/latest/
@nasthagiri, @frrrances please review video_uploads.rst in particular.
@lou-wang, @srpearce please review from your knowledge bases. 
@mhoeber, @catong FYI.
Sending HTML link to Greg Martin and Rachel Grubb also. Please tag any other reviewers as appropriate.
Rachel would like to begin sending the HTML link to interested course teams ASAP.
Change: To help course teams at partner institutions meet the challenge of delivering high quality video experiences to as many students as possible, edX offers video file processing and media hosting services.

Revise to: To help course teams at partner institutions meet the challenge of delivering high quality video experiences to as many students as possible, edX offers media hosting services to address alternative playback and download needs.