Added a rough draft of the 1.0 porting guide, and an obviously incomplete placeholder for the 1.0 release notes. Thanks to daonb, patrickf, and ramiro for contributions to this porting guide. Refs #8438.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8856 bcc190cf-cafb-0310-a4f2-bffc1f526a37