Fix template loaders for django 1.11

Fix template loaders for django 1.11

Seems django 1.11 automatically enables caching template loader, which
of course breaks the ability to make any changes to the pages of a
website without restarting it. And there is no way to turn it off other
than to explicitly configure individual loders (the logic to turn it on
in non-debug configurations is hardcoded and cannot be changed).