Update PyPi default server.

Currently, the default server for PyPi deployments is http://www.python.org/pypi.  This creates a silent bug.  Deployment will return a 200, but the server being updated is not what serves `pip` or `https://pypi.python.org`. 

The value has been changed to http://pypi.python.org/pypi by the commits in this pull request.

Further documentation of this problem exists: https://bitbucket.org/pypa/pypi/issue/123/sdist-upload-returns-success-but-no-new