Support for studio-based Video Pipeline.
Allow "colon" in edx-video_ids.
Added get_videos_for_ids method.
Added status and created fields.
Organized and added tests. Removed colon

-Organized tests for consistency and to increase coverage.
 Added more tests for get_video_for_ids, get_url_for_profile(s),
 and having a colon in edx_video_id.
-Deleted unused test_models.py
-Updated outdated readme note
-Added missing documentation for some functions
-Removed colon
Merge pull request #32 from edx/mobile/video_upload-val

Support for studio-based Video Pipeline.