code: function(deg) {
              this.callBase({
                  beginValue: 0,
                  finishValue: deg,
                  setter: function(target, value, timeline) {
                      var delta = timeline.getDelta();
                      target.rotate(delta);
                  }
              });
          }
docs: @constructor
  @for kity.RotateAnimator
  
  @grammar new kity.RotateAnimator(deg, ax, ay)
  
  @param  {Number} deg 要旋转的角度