Fixed #6262 -- Added a cached template loader, and modified existing template...

Fixed #6262 -- Added a cached template loader, and modified existing template loaders and tag to be cacheable. Thanks to Mike Malone for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11862 bcc190cf-cafb-0310-a4f2-bffc1f526a37