Changes 2/20/14

NSF:

• Learned more about how python modules, classes, and namespaces work
• Learned how to do the Python equivalent of Java's try{}catch{}
• Moved all parsing code into patparser.py to clean up a bit
• Moved unzipping code from the main() method into a separate method 
• Added a check for badzipfile exception, and the zip will be redownloaded if this is thrown