Fix ensure_dir: check that path is actually a directory path
Comment on ensure_dir function
Merge pull request #887 from b3b/develop

Fix ensure_dir: check that path is actually a directory path
Merge pull request #875 from dylanjbarth/bundle_subtitles

Bundle subtitles w/ language packs
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into develop
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.
allow updating by switching to a branch
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into update_to_branch

Conflicts:
	kalite/management/commands/update.py
Removing merge marker
Update search to be more efficient, contain HTML labels, and go directly to the selected page on click.
Merge branch 'release-0.11' into update_to_branch
Remove necessary punctuation markers (for logical division), to untranslated code (would have to be copied by translator, reduced poptential errors)
Fixes #1052--change cache on every build