Fixed #6188, #6304, #6618, #6969, #8758, #8989, #10334, #11069, #11973 and #12403 -- Modified the syndication framework to use class-based views. Thanks to Ben Firshman for his work on this patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12338 bcc190cf-cafb-0310-a4f2-bffc1f526a37