Minor changes in the math module.
Merge branch 'elena' of github.com:PeithVergil/angrynerds into dev11b
Minor changes to the Grid class in the grid module.
Creating a tile engine.
Added the TileMap class which is used to represent the World in tiles.
Added a Py2exe setup script.
Added author name and version number in the setup.py script.
Added an icon_resources to the setup.py script.
Fixed app name.
Merge branch 'master' of github.com:PeithVergil/angrynerds
Added a set_icon call for the pygame display object.
Added icon.png. Fixed icon compatibility on Windows.