Reformat MinntonkaGame.py to be PEP 8-compliant

[davidtcalabrese]

PEP 8 is the style guide written by BDFL Guido Von Rossum.

The issues I see are:

• [ ] 1. Indentation should be in multiples of four.
• [ ] 2. Two blank lines before top-level function definitions.
• [ ] 3. Line length should be < 120 characters.
• [ ] 4. File should end with one newline.