Migrating model syncing to a (static) class, rather than flat functions shared through settings.py
Merge branch 'syncing_models' into develop
Migrating model syncing to a (static) class, rather than flat functions shared through settings.py.  Similar for device_counting.
Merge branch 'syncing_models' of github.com:bcipolli/ka-lite into syncing_models

Conflicts:
	kalite/securesync/models.py
Merge branch 'syncing_models' into develop
Merge branch 'syncing_models' of github.com:bcipolli/ka-lite into syncing_models

Conflicts:
	kalite/securesync/models.py
Merge branch 'syncing_models' of github.com:bcipolli/ka-lite into syncing_models
Merge branch 'syncing_models' into develop