Adds python packages to Makefile for complete beginners

When getting started with this repository, I found it confusing as a complete python newbie. The error output about "nosetests" wasn't really helpful. Adding the python tools to the Makefile would assist new users get started quickly.

This may not be the best place for it, but I wanted to offer this up as an alternative if it will help.

Before you run make, run `sudo make python-tools` and it will install the python deps required to work with the project.