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: An automated process then begins to create additional formats and store them for you, ready for students to access, with the hosting services.

revise: Once your files are uploaded, it triggers an automated process that creates additional file formats and uploads the files to YouTube and AWS, so that your videos are ready for students to access and download. This process takes 24 hours to complete. You'll also be able to track your uploads and see the status of your files in the Video Uploads page in Studio.