Remove Cython as setup_requires
Remove Cython as setup_requires

grigorisg9gr/menpo,menpo/menpo,menpo/menpo,yuxiang-zhou/menpo,yuxiang-zhou/menpo,patricksnape/menpo,patricksnape/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,grigorisg9gr/menpo,patricksnape/menpo,menpo/menpo