function Scale(node) {
    Position.call(this, node);

    this._x.set(1);
    this._y.set(1);
    this._z.set(1);
}
Scale is a component that allows the tweening of a Node's scale. Scale
happens about a Node's origin which is by default [0, 0, .5].

@class Scale
@augments Position

@param {Node} node Node that the Scale component will be attached to