Bug 831071: Rename Video model to Video2012 and move old views.
Bug 831071: Update requests and add requests-oauthlib.
Bug 831071: Add Video2013 model.
Bug 831071: Add Vimeo API functions.
Bug 831071: Hook up submit page to Vimeo API.
Bug 831071: Add custom error page for overlay pages.
Bug 831071: Add filesize verification.
Add tests and fix a few small bugs.
Small review fix.