beautify!

$ npm install -g js-beautify
$ js-beautify index.js > index-beauty.js
$ mv index-beauty.js index.js
Add missing semicolons
use a = 1; b = 2; instead of a = 1, b = 1;
js-beautify -r index.js
use strict
extract ScoreLabel class
extract TimerLabel
extract KumaGame
var x = yy; instead of var x =null; x = yy;
set scene background at KumaGame#initialize
simplify score message
extract KumaGame#scoreMessage
move GAME_LIMIT_TIME to KumaGame
extract KumaGame#timeLeft
extract KumaGame#isEnd
extract KumaGame#end
extract kumaNum :D
extract KumaGame#initRootScene
move scoreLabel itno KumaGame
move timerLabel itno KumaGame