finally figured out permissions issues\!
Adding missing import, catching all possible outcomes in function.
We no longer need base_distributed.  And thanks to #939, this was easy!
time zone should default to None (determine via system), and allow hard-coded overrides (when that doesn't work)
Merge pull request #977 from bcipolli/kill_base_distributed

We no longer need base_distributed.  And thanks to #939, this was easy!
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into pretty_alerts

Conflicts:
	kalite/templates/base.html