Inspired by Gabriele Cirulli game available on the website: http://gabrielecirulli.github.io/2048/
Swipe to move all tiles. When two tiles with the same number touch, they merge into one.
Get to the 2048 tile, and reach a high score!
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灵感来源于 Gabriele Cirulli 网站上的游戏：
http://gabrielecirulli.github.io/2048/
通过滑动来移动方块，当两个一样的数字碰撞到一起，将会合二为一
当数字为2048时，您将胜利
Author: Rain Wu