TSUNE-79 Add simplejson to requirements
TSUNE-79 Create upload app for simple file upload
TSUNE-79 Make anki importer ignore empty tags
TSUNE-79 Check spans during anki import for styles
TSUNE-79 Use django 1.5 method for atomic transaction
TSUNE-79 Use path of .apkg as zip working dir
TSUNE-79 Fix mathjax preamble
TSUNE-79 Add upload app to base settings
TSUNE-79 Add upload urls to main urls
TSUNE-79 Add anki import link to navbar actions