move json responder into own function
move json responder into own function

geotagx/geotagx-pybossa-archive,jean/pybossa,CulturePlex/pybossa,geotagx/pybossa,CulturePlex/pybossa,stefanhahmann/pybossa,geotagx/geotagx-pybossa-archive,proyectos-analizo-info/pybossa-analizo-info,stefanhahmann/pybossa,Scifabric/pybossa,inteligencia-coletiva-lsd/pybossa,harihpr/tweetclickers,CulturePlex/pybossa,PyBossa/pybossa,geotagx/pybossa,proyectos-analizo-info/pybossa-analizo-info,Scifabric/pybossa,geotagx/geotagx-pybossa-archive,PyBossa/pybossa,harihpr/tweetclickers,OpenNewsLabs/pybossa,geotagx/geotagx-pybossa-archive,OpenNewsLabs/pybossa,proyectos-analizo-info/pybossa-analizo-info,geotagx/geotagx-pybossa-archive,jean/pybossa,inteligencia-coletiva-lsd/pybossa