Add stack trace on error in feedback functioni
Add stack trace on error in feedback functioni

br/apns4erl,comtihon/apns4erl,rmoorman/apns4erl,br/apns4erl,tomekowal/apns4erl,scatterbrain/apns4erl,irccloud/apns4erl,Soulforged/apns4erl