[1.0.X]: Fixed #9065 -- Fixed the `timesince` and `timeuntil` template tags to...

[1.0.X]: 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.

Backport of r10215 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10216 bcc190cf-cafb-0310-a4f2-bffc1f526a37