Fixes to a few compilation errors

While trying to compile the AI on my Windows 7 Desktop (Python 3.4.0, Visual Studio Express 2012) I encountered a few syntax errors in `2048.cpp` and `2048.py`. These changes fix the errors and let the dll/exe compile and the .py file execute.

I'm not sure if these changes are necessary, or if the changes to the cpp file work or not. I can't get the AI to run on my PC. It can't find the dll even though it is there.

Looking forward to your thoughts,
Kieran