Nove central server code for i18n into the i18n app, mark as "central server only"
Refactor common updates code into a base.html file that can be shared by all updates.
Move i18n-generated js files into js directory
indenting blocks
Making languagepackdownload run through updates app
Get update_languages to work with jsonp, current json output format
Add central/distributed testing info to the doc
Cleanup of jsonp logic on central server.
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into update_language

Conflicts:
	.gitignore
	kalite/static/js/update_videos.js
	kalite/templates/exercise.html
	kalite/templates/updates/update_videos.html
	kalite/updates/management/commands/languagepackdownload.py
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into update_language

Conflicts:
	kalite/updates/management/commands/classes.py
Merge pull request #1073 from bcipolli/update_language

Final cleanup / refactoring of i18n code, refactor updates to have a base.html