[COOK-3284] - Remove setuptools upgrade

https://tickets.opscode.com/browse/COOK-3284

Since `pip` was upgraded to be [compatible with the latest versions of `setuptools`](http://www.pip-installer.org/en/latest/news.html#id2) (0.7.6 and 1.0) the `setuptools` upgrade within the supervisor cookbook is no longer needed.

I've added a minitest to ensure the version of pip installed is the latest version, 1.4.1.

As of 20-Sept-2013 the `setuptools` dependency was removed from Supervisor altogether.   
* issue - https://github.com/Supervisor/supervisor/issues/283
* fix - https://github.com/Supervisor/supervisor/commit/4cd438b4f0815a3b170c4322994ea4b3562e7cf1