Fix setup.py to create working exe and remove execess setup.py

This fixes the `setup.py` for py2exe.
The build requires python 2.7.x 32bit, py2exe 32bit as well as pyglet.
All the resources are copied with the release as well, so after running the following commands:
```
python setup.py install
python setup.py py2exe
```
You should find the game runnable at `release/win32/game.exe`.