Start Python Generators lab

This lab is designed to introduce Python generators.
adding content to generator labs

Added more content for combinations and permutations.  Solutions for
same added as well.
Merge branch 'master' into python
Merge branch 'master' into python
reorganize python labs

Reorganize Python labs so they fit with the organization of the rest of
the lab manual.
section on saving arrays

Added a little section that describes how to save and load NumPy arrays.
complete Getting Started lab

Add a problem to first lab.  Calling this completed for now.
added a possible problem

Added a problem written by Ian.  This lab needs some serious focusing.
It feels very scattered to me.  Maybe it just needs a more coherent way
of tying things together.
Merge pull request #75 from ayr0/python

some more additions to the python labs.