added contributor in package.json
added contributor in package.json

SpireTeam/yodel-gcm,pablonazareno/node-gcm,kaija/node-gcm,bastienleonard/node-gcm,SpireTeam/spire-fcm,surespot/node-gcm,Instagram/node-gcm,mauron85/node-gcm,imjerrybao/node-gcm