Added tests for save, update, delete category methods
Added tests for save, update, delete category methods

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