Finally load all models.

Load all models for the media_types. This was stopped by a
celery problem. But that is now fixed.

mediagoblin/db/sql/open.py

@@ -45,8 +45,7 @@ class DatabaseMaster(object):
 def load_models(app_config):
     import mediagoblin.db.sql.models
 
-    # TODO/Fix: This breaks celery
-    if False:
+    if True:
         for media_type in app_config['media_types']:
             _log.debug("Loading %s.models", media_type)
             __import__(media_type + ".models")