Regenerate gemspec for version 3.1.0
Regenerate gemspec for version 3.1.0

nebulab/authlogic,janusnic/authlogic,sideci-sample/sideci-sample-authlogic,theiren46/authlogic,tiegz/authlogic,expertiza/authlogic,rchekaluk/authlogic,boone/authlogic,jaredbeck/authlogic,lukeasrodgers/authlogic,bioritmo/authlogic,Photovisi/authlogic,manvil/authlogic,binarylogic/authlogic,antonifs/authlogic,nulogy/authlogic