Relicense the package as MIT license. Drop licensing as PSF and Zope as...

Relicense the package as MIT license. Drop licensing as PSF and Zope as neither of those licenses grant authority for use outside their respective projects. Vendored projects are licensed under their respective licenses, currently MIT for six and Apache v2 for packaging. Fixes #132.

setup.py

@@ -75,7 +75,6 @@ setup_params = dict(
                 "Python packages",
     author="Python Packaging Authority",
     author_email="distutils-sig@python.org",
-    license="PSF or ZPL",
     long_description=long_description,
     keywords="CPAN PyPI distutils eggs package management",
     url="https://bitbucket.org/pypa/setuptools",
@@ -134,8 +133,7 @@ setup_params = dict(
     classifiers=textwrap.dedent("""
         Development Status :: 5 - Production/Stable
         Intended Audience :: Developers
-        License :: OSI Approved :: Python Software Foundation License
-        License :: OSI Approved :: Zope Public License
+        License :: OSI Approved :: MIT License
         Operating System :: OS Independent
         Programming Language :: Python :: 2.6
         Programming Language :: Python :: 2.7