Voluptuous shouldn't list setuptools as an install requirement

[HolgerPeters]

Voluptuous lists setuptools in its install_requires in the setup.py

    install_requires=[
        'setuptools >= 0.6b1',
]

Packages should list all their dependencies that they need at runtime in install_requires. Setuptools however isn't necessary at runtime. Probably a more fitting attribute for listing setuptools with a constraint would be setup_requires. Nevertheless I suggest dropping mention of setuptools in requirements alltogether. since the constraint you give here (>= 0.6b1) basically says you should install a setuptools version later than that of 2006-05-12 (https://pypi.python.org/pypi/setuptools/0.6b1).