Reformulating get_video_urls to get info on all available videos for a video_id
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into dubbed_video_support

Conflicts:
	kalite/main/views.py
	kalite/templates/search_page.html
Changing schema for subtitles, doing mapping from lang to lang code, fixing small bugs.
Add KA strings to languagelookup map, have a meaningful default for when a video is not in the dubbed videos map, so they're not lost.
Merge branch 'store_parent_ids' into dubbed_video_support
Merge branch 'better_topic_caching' into dubbed_video_support
Merge pull request #1110 from bcipolli/dubbed_video_support

Initial support for dubbed videos