Fixed #12991 -- Added unittest2 support. Thanks to PaulM for the draft patch, and to Luke, Karen, Justin, Alex, Łukasz Rekucki, and Chuck Harmston for their help testing and reviewing the final patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14139 bcc190cf-cafb-0310-a4f2-bffc1f526a37