Adding session02 homework

Pull request is from master because I tried out the merge function, then kept doing session02 homework in the newly merged master.  I'll keep the next HW on a session03 branch.  Can't keep this stuff straight.  :-)

Thanks!
Robert
On Sun, Oct 12, 2014 at 9:36 PM, Robert Perkins <notifications@github.com>
wrote:

> I thought the HW instructions said to go up to m=4, n=4 on the table in
> the Wikipedia article,
>
yup -- I wanted you to hit that recursion error... :-)

> so I started out with an assert statement for each cell in the table (the
> table gave the higher order answers as powers of two).
>
ahh -- I had forgotten those where there.

Nice job.

-Chris


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