Replace jingo.render with django.shortcuts.render.
Clean up settings files a bit.
Replace direct use of MEDIA_URL with static helper.
Small fixes to get base app working.
Update deprecated imports.
Update locale field import path in migrations.
Fix import paths in various tests.
Wipe out the mothership and replace it with a base app.

Because fixing tests that were going away anyway is silly.
Tweak existing tests and files to work now that mothership is gone.