added different coloured balls and random generator
improved random ball color picker to use game.rnd.pick
Merge pull request #11 from johnlok/colorful_balls

added different coloured balls and random generator
extra lives function started.
Merge branch 'master' into extra_lives
playerball life icons now appear in top right hand corner
player lives implemented. need to indicate that player has died next.
player death animation, but life feature changes gameplay. need to fix
fixed a bug where playerBall would be created twice on collision. also made changes to game mechanics. Player size is persisted through death.
Merge pull request #12 from johnlok/extra_lives

Extra lives