Fixed bug with Meta.ordering being ignored when slicing a single item off a...

Fixed bug with Meta.ordering being ignored when slicing a single item off a QuerySet.  Thanks, Gábor Fawkes.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2970 bcc190cf-cafb-0310-a4f2-bffc1f526a37