Remove cruft
Refactoring VideoFile and LanguagePack out of main, into updates and i18n apps, respectively
Rearrange context processors / middleware
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into refactor_main
Updating tests, bringing bugfix from a downstream branch back here.
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into refactor_main
Merge pull request #1020 from bcipolli/refactor_main

Refactoring VideoFile and LanguagePack out of main, into updates and i18n apps, respectively