Move MindTouch redirects to be the last thing we put in urlpatterns.

This (hopefully) solves the issue several people have run into with
local dev instances, since in that setup the MT redirects conflict
with the local static-media patterns. Local instances don't actually
need those URLs, and production doesn't use the static-media patterns,
so switching the order should solve the problem.
Merge pull request #815 from ubernostrum/media-url-conflict

Move MindTouch redirects to be the last thing we put in urlpatterns.