Respond to resize events
New major API change

Changed return values and added reset method.
Wait for user input after restarting the game

This is the same behavior as when the game is started.
Display how many times the user played the game
Show high score on canvas

This changes the BouncePainter and Cog API.
Change canvases and input surface

There are now only 3 canvases (previously 5) and the original canvas is
used as the input surface.