Cache n_available_tasks for 3 hours
Cache n_available_tasks for 3 hours

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