Fixed #9065 -- Fixed the `timesince` and `timeuntil` template tags to work...

Fixed #9065 -- Fixed the `timesince` and `timeuntil` template tags to work when both values involved are date objects, thanks to morty and mboersma for the patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10215 bcc190cf-cafb-0310-a4f2-bffc1f526a37