Use scoped_session for slave session
Use scoped_session for slave session

stefanhahmann/pybossa,Scifabric/pybossa,harihpr/tweetclickers,geotagx/pybossa,OpenNewsLabs/pybossa,inteligencia-coletiva-lsd/pybossa,stefanhahmann/pybossa,jean/pybossa,jean/pybossa,Scifabric/pybossa,OpenNewsLabs/pybossa,PyBossa/pybossa,harihpr/tweetclickers,geotagx/pybossa,PyBossa/pybossa,inteligencia-coletiva-lsd/pybossa