Fixed #4563 -- Context.pop/push/update return the top-level dictionary (the new

one for push() and update(), the one removed for pop()). Based on a patch from
Brian Harring.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6854 bcc190cf-cafb-0310-a4f2-bffc1f526a37