Remove unused imports
Remove unused imports

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