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function Tile(position, value) {
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    this.x                = position.x;
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    this.y                = position.y;
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    this.value            = value || 2;
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    this.previousPosition = null;
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    this.mergedFrom       = null; // Tracks tiles that merged together
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  }
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  Tile.prototype.savePosition = function () {
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    this.previousPosition = { x: this.x, y: this.y };
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  };
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  Tile.prototype.updatePosition = function (position) {
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    this.x = position.x;
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    this.y = position.y;
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  };
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