Add the validator to the username forms.
Add the validator to the username forms.

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