added create_video/profile to api.py for populating database

create_video and create_profile  will be used to populate database
for internal (not via HTTP requests) use.

Other notes:
-profile_name now has regex validator
-ddt==0.8.0
-100 percent coverage
Merge pull request #13 from edx/clee/populatedb

added create_video/profile to api.py for populating database
Added subtitle model and API
Added tests for subtitles
lookup subtitles by language rather than id