fixed py3k regression in zmqstream
fixed py3k regression in zmqstream

dash-dash/pyzmq,swn1/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,yyt030/pyzmq,caidongyun/pyzmq,yyt030/pyzmq,ArvinPan/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,swn1/pyzmq,Mustard-Systems-Ltd/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq