Added cached versions of functions apps_contributed, published_apps, draft_apps and hidden_apps
Added cached versions of functions apps_contributed, published_apps, draft_apps and hidden_apps

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