[1.1.X] Fixed #6228: Changed common middleware to respect request-specific...

[1.1.X] Fixed #6228: Changed common middleware to respect request-specific urlconf. Thanks trey, skevy, and mikexstudios. 

r12704 and r12705 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12706 bcc190cf-cafb-0310-a4f2-bffc1f526a37