Fix #130 - Fix on session factory test.

   . Create an empty session factory object without ip definition
      (IPAddressField is not mandatory).

Author: philippe VESSIERE

ban/tests/test_factories.py

@@ -45,5 +45,5 @@ def test_position_can_be_instanciated():
 
 
 def test_session_can_be_instanciated():
-    session = factories.SessionFactory(ip='127.0.0.1')
+    session = factories.SessionFactory()
     assert session.ip == '127.0.0.1'