Added the Python function to evaluate the Ackermann function to the session02 directory of my student directory
First commit of series.py function.  Calculates Fibanocci series up to 20th term correctly.  Contains a useful docstring and some assertions for some basic testing.
Commit of series.py after adding a new function to evaluate the nth term of the lucas function.  Checked that it gives the correct result up to the 20th term of the Lucas fuction.  Added some basic assertion tests.
Added the sum_series function to the series.py module.  Has default zeroth and first terms to give the nth term of the Fibonacci series.  Will give nth term of arbitrary series given users specified zeroth and first terms to work from.  Some basic assertion tests to show it computes the correct nth term in the series and a docstring giving some details on what the function does.
For completeness, push up the homework assignment from the first session as well.
Push up my lightening talk too.
Merge pull request #15 from imdavis/master

Ian M. Davis Homework

Love those docstrings!

Very nicely done.

One thing -- it's not really worth catching the AssertionErrors -- they will get hit anyway, so not a lot of value added. But good form for Exceptions in general.