making UserLog-related admin conditionally available, fixing whitespace (tab vs space) issue
Migrated and consolidated entire central/utils into two management commands.
A start at solving the url issue with subtitle support.
Fixed import of hardcoded language list to use dynamically generated one from subtitle_counts.json.
Merge pull request #262 from bcipolli/user_log_admin

making UserLog-related admin conditionally available
Deleted generate subtitle counts accidentally. Adding it back in and calling it automatically when we download more subtitles.
So actually, language list is used by the script the generates subtitle counts, and if a language doesn't exist there, it throws an error to be updated. Changing this back to use languages.json as our official source.
Merge branch 'develop' of git://github.com/learningequality/ka-lite into subtitles
using JSONP to get data from central server.
Merge branch 'subtitles' of github.com:dylanjbarth/ka-lite into subtitles

Conflicts:
	kalite/central/api_urls.py
	kalite/central/api_views.py
	kalite/templates/video_download.html