When the green flag is pressed, the hippo will always start in the same location and then move around the screen. When it gets to the edge, the hippo will bounce and move in a random direction. When the mouse pointer touches the hippo, it will stop. When the mouse pointer is not touching the hippo, it should move. When clicked, the color of the hippo will change.
This is a challenge from the 2015 Summer Workshop. Contains programming for gliding to random spots and for "bouncing".
