Fixed #15253 -- Added 1.1.3 release notes, and added sections to the 1.2.4 and...

Fixed #15253 -- Added 1.1.3 release notes, and added sections to the 1.2.4 and 1.3 release notes about the December security announcement.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15485 bcc190cf-cafb-0310-a4f2-bffc1f526a37