Added gem signature suggestions as described in http://guides.rubygems.org/security/
Added gem signature suggestions as described in
http://guides.rubygems.org/security/

mort666/dawnscanner,paradoja/dawnscanner,didacte/dawnscanner,wmotti/dawnscanner,thesp0nge/dawnscanner,jasnow/dawnscanner,cyberintruder/dawnscanner