Update default Python plus Pip and Setuptools

* $ curl
https://pypi.python.org/packages/e7/a8/7556133689add8d1a54c0b14aeff0acb0
3c64707ce100ecd53934da1aa13/pip-8.1.2.tar.gz -o pip-8.1.2.tar.gz
* $ curl
https://pypi.python.org/packages/9f/7c/0a33c528164f1b7ff8cf0684cf88c2e73
3c8ae0119ceca4a3955c7fc059d/setuptools-23.1.0.tar.gz -o
setuptools-23.1.0.tar.gz
* $ ls
* $ rm pip-8.1.1.tar.gz
* $ rm setuptools-20.4.tar.gz