Fixed #12775 -- Modified the --exclude argument to dumpdata to allow exclusion...

Fixed #12775 -- Modified the --exclude argument to dumpdata to allow exclusion of individual models. Thanks to emulbreh for the suggestion, and Joshua Ginsberg for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13511 bcc190cf-cafb-0310-a4f2-bffc1f526a37