Commit countingChange.py

Counting change example translated from Scheme to Python 2
From Structure and Interpretation of Computer Programs
Chapter 1.2.2: Tree Recursion

Problem Statement:
How many different ways can we make change of $1.00, given half-dollars,

quarters, dimes, nickels, and pennies? More generally, can we write a
procedure
to compute the number of ways to change any given amount of money?

Online:
http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-11.html#%_sec_1.2.2