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

    var initial = node.getMountPoint();

    this._x.set(initial[0]);
    this._y.set(initial[1]);
    this._z.set(initial[2]);
}
MountPoint is a component designed to allow for smooth tweening
of where on the Node it is attached to the parent.

@class MountPoint
@augments Position

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