Handle bad cells from the mapping spreadsheet by skipping them.
Ahaha. If it's not broken, fix it. If it is, fix it too.
Bug fix for #2334.
On server start, clear is_running on any old chronograph jobs.
Required import for clearing of is_running on Jobs.
Merge pull request #2337 from cpauya/feature/2334-Cannot-sync-server-on-Mac-to-central-server

Bug fix for #2334.
Increase sleep time in test_delete_group test, to try to help Travis.
Merge branch 'release-0.12.0' of github.com:learningequality/ka-lite into release-0.12.0
in delete button tests: make sure teacher is part of facility
use an updated version of firefox for travis
Adds wait for alert_is_present on generic method for accepting
modal dialogs.

Conflicts:
	kalite/testing/browser.py
simplify test_delete_facility test
simplify test_delete_group test
metadata for 0.12.6
Merge pull request #2351 from learningequality/release-0.12.0

Release 0.12.6