Add 20 featured apps to front page.
Add 20 featured apps to front page.

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