NODE_CACHE nodes can share dict objects with TOPICS.  More efficient, and when you change one the other changes--GOOD.
Adding BACKUP_VIDEO_SOURCE setting, to allow function for streaming videos from an alternate, online source.
use logging.error / logging.warn in appropriate places, instead of logging.debug
Fix fontawesome path for production
Merge pull request #715 from arnaudbenard/fontawesome-fix

Fix fontawesome path for production
Allowing manual marking of devices that are for demo/testing purposes only, and display in the central server control panel.

Conflicts:
	kalite/control_panel/views.py
	kalite/templates/control_panel/zone_management.html
Merge branch 'release-central' of github.com:learningequality/ka-lite into release-central
Fixing typo on the landing page..
Merge branch 'release-central' of github.com:learningequality/ka-lite into release-central
Move summary page to stats app.  Modify to show most recent updates (more useful), with links opening in new windows (avoid requerying) and links to device sync history.
tweaking devices page, to show metadata.  Add titles to pages with missing titles
showing org information with zone information on registration page.
sort zones by name. Add org info second, and only if there's more than one org
create default org/zone for users with none.
sorting by org first; sort both by case-insensitive sort
Merge pull request #710 from bcipolli/use_logging_error

use logging.error / logging.warn in appropriate places, instead of logging.debug
Merge pull request #717 from bcipolli/last_uploaded_summary

Move summary page to stats app, modifying to show more informative stuff
Merge pull request #718 from bcipolli/device_and_title_tweaks

tweaking devices page, to show device metadata.  Add titles to pages with missing
Merge branch 'show_org_in_registration_release-central' of github.com:bcipolli/ka-lite into release-central
Now, aggregate in the view, instead of (failing to do it) in the query.