Fixed promblem with head rules. Add sound effects
 Changes to be committed:
	modified:   public/js/game/bones.js
	modified:   public/js/game/game.js
	modified:   public/js/game/piece.js
	new file:   public/js/ion.sound.min.js
	modified:   public/js/system.js
	new file:   public/sounds/dice.mp3
	new file:   public/sounds/piece.mp3
	modified:   views/index.ejs