Switch to the new template loaders from Djblets.
Review Request #6092 — Created July 10, 2014 and submitted
This updates our list of template loaders to use the new
conditional_cached (which only caches if DEBUG = False) and
namespaced_app_dirs (which allows app module prefixes for paths).
Unit tests pass.
Had no issues using the site. Didn't see things cached when DEBUG was True.
I was able to use a prefix for an upcoming change.