Ensure Django's test suite is included when we build release packages.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10230 bcc190cf-cafb-0310-a4f2-bffc1f526a37

MANIFEST.in

@@ -10,6 +10,7 @@ recursive-include docs *
 recursive-include scripts *
 recursive-include examples *
 recursive-include extras *
+recursive-include tests *
 recursive-include django/conf/locale *
 recursive-include django/contrib/admin/templates *
 recursive-include django/contrib/admin/media *