fix for latest msgpack-c; fix copy_exception
fix for latest msgpack-c; fix copy_exception

alanpich/AutobahnCpp,jpetso/AutobahnCpp,e12009/AutobahnCpp,jpetso/AutobahnCpp,tempbottle/AutobahnCpp,tavendo/AutobahnCpp,tavendo/AutobahnCpp,shuyunqi/AutobahnCpp,shuyunqi/AutobahnCpp,stopthatcow/AutobahnCpp,tempbottle/AutobahnCpp,stopthatcow/AutobahnCpp,alanpich/AutobahnCpp,alanpich/AutobahnCpp,e12009/AutobahnCpp,jpetso/AutobahnCpp