Fixed #6295 -- Made the {% for %} tag a bit more efficient by creating a...

Fixed #6295 -- Made the {% for %} tag a bit more efficient by creating a single context dictionary rather than recreating it each time through the loop. Thanks, Ned Batchelder

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6981 bcc190cf-cafb-0310-a4f2-bffc1f526a37