Added documentation and support for all gravatar options
Added documentation and support for all gravatar options

stuart-thackray/nitrogen,nitrogen/nitrogen,stuart-thackray/nitrogen,joaohf/nitrogen,joaohf/nitrogen,choptastic/nitrogen,kaos/nitrogen,choptastic/nitrogen,kevinmontuori/nitrogen,robsc/nitrogen,nitrogen/nitrogen,nitrogen/nitrogen,kevinmontuori/nitrogen,kaos/nitrogen,kevinmontuori/nitrogen,joaohf/nitrogen,stuart-thackray/nitrogen,robsc/nitrogen,choptastic/nitrogen