fix DictDB/MongoDB arguments disagreement

IPython/zmq/parallel/dictdb.py

@@ -90,7 +90,7 b' class DictDB(BaseDB):'
     """
     _records = None
     
-    def __init__(self):
+    def __init__(self, *args, **kwargs):
         self._records = dict()
     
     def _match_one(self, rec, tests):

IPython/zmq/parallel/hub.py

@@ -237,7 +237,7 b' class HubFactory(RegistrationFactory):'
         sub = ZMQStream(sub, loop)
         
         # connect the db
-        self.db = import_item(self.db_class)()
+        self.db = import_item(self.db_class)(self.session.session)
         time.sleep(.25)
 
         # build connection dicts