use setuptools to dynamic load freeze pyzmq egg
use setuptools to dynamic load freeze pyzmq egg

refine code style as minrk's comments.
Mustard-Systems-Ltd/pyzmq,dash-dash/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,swn1/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,caidongyun/pyzmq,yyt030/pyzmq,swn1/pyzmq,caidongyun/pyzmq,ArvinPan/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,caidongyun/pyzmq