[doc/install][s]: bring install docs up to date.
[doc/install][s]: bring install docs up to date.

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