Adding first management command, to check data expectations / integrity
Merge branch 'develop' into dashboard_stats_1

Conflicts:
	kalite/settings.py
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into dashboard_stats_1

Conflicts:
	kalite/settings.py
Cleaning up settings, to only load apps as appropriate.
Fixing up HTML to be compliant, according to http://validator.w3.org/
Call code to move subtitles from old location to new, from setup / update
add back in wait for cronserver to start
add polib to python-packages
remove nonexercise metadata from exercise po files before concatenating them
remove subprocess.check_output for the sake of py2.6 compatibility
Ensure english language pack upon migration.
Stopgap z-index solution to keep logo on top
sort available language packs
fix the removal of nonmetadata
Merge remote-tracking branch 'refs/remotes/upstream/develop' into 1244
don't use -i since that's only for GNU sed
cleanup of unused function; documentation and fixing of messages
Changes to khanload, to stamp props directly onto topic tree.
Additions to topics.json (knowledge map json files can be removed, but will remove only after migrating interface code)
Updates to use new schema (and do translations).  Faster & cleaner, but far from perfect...