Reverted the introduction of shared_models.

The recent improvements should make shared_models obsolete.

This reverts commit 1059da8de6, reversing
changes made to 4fa7f3cdd9.

tests/syncdb_signals/tests.py

@@ -3,7 +3,7 @@ from django.test import TestCase
 from django.core import management
 from django.utils import six
 
-from shared_models import models
+from . import models
 
 
 PRE_SYNCDB_ARGS = ['app', 'create_models', 'verbosity', 'interactive', 'db']