add license information
add license information

This way it can be used with the rubygems.org API

jeremyevans/mail,schepedw/mail,missive/mail,pascalbetz/mail,carsonreinke/mail,kert-io/mail,schepedw/mail,wktk/mail,pushrax/mail,kaineer/mail,EdwardPantoja/mail,benmmurphy/mail,jonkgrimes/mail,kaineer/mail,pushrax/mail,planio-gmbh/mail,mikel/mail,yujinakayama/mail,smallspark/mail,owenr/mail,zacholauson/mail,kjg/mail,jeremy/mail,Schniz/mail,0x00evil/mail,kainlite/mail,smallspark/mail,schneems/mail,wktk/mail,kjg/mail,agaridata/mail,EdwardPantoja/mail,jeremyevans/mail,carsonreinke/mail,kert-io/mail,zacholauson/mail,pjskennedy/mail,pjskennedy/mail,schneems/mail,0x00evil/mail,agaridata/mail,jonkgrimes/mail,benmmurphy/mail,jeremy/mail