Refactor stats_user to use SQL queries
Refactor stats_user to use SQL queries

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