Fixed #2675 -- Changed the `timeuntil` and `timesince` template filters to...

Fixed #2675 -- Changed the `timeuntil` and `timesince` template filters to display "0 minutes" when passed a past or future date respectively instead of "-1 years, 12 months".  Thanks to nickefford for the patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6366 bcc190cf-cafb-0310-a4f2-bffc1f526a37