code: function() {
              var a = Kinetic.Animation,
                  animations = a.animations,
                  len = animations.length,
                  n;
  
              for(n = 0; n < len; n++) {
                  if(animations[n].id === this.id) {
                      return true;
                  }
              }
              return false;
          }
docs: determine if animation is running or not.  returns true or false
  @method
  @memberof Kinetic.Animation.prototype