COMP 1671, Section 1, Fall 2008
LAB 2
Create a simulation with two types of Actors.
The image for each actor should be different and the movement
of each actor should be different. Create the world with
numerous actors of each type by adding actor object creation
code in the World constructor.
After doing this, make the objects bounce off of world boundaries
by negating x/y velocities when they intersect a boundary.