[1.0.X] Fixed #9957: feeds now respect time zone information provided by the...

[1.0.X] Fixed #9957: feeds now respect time zone information provided by the pub date. Backport of r10435 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10436 bcc190cf-cafb-0310-a4f2-bffc1f526a37