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.
Merge branch 'develop' of github.com:learningequality/ka-lite into dashboard_stats_1

Conflicts:
	kalite/settings.py
Merge pull request #1602 from bcipolli/dashboard_stats_1

Add command for data verification on the central server.