docs: function addClassInView(config) {
    var selector = config.selector || InViewClassAdder.DefaultConfig.selector;
    var className = config.className || InViewClassAdder.DefaultConfig.className;
    var delay = config.delay || InViewClassAdder.DefaultConfig.delay;
    var fromTop = config.fromTop || InViewClassAdder.DefaultConfig.fromTop;
    var offset = config.offset;
    var classAdder = new InViewClassAdder(selector, className, offset, delay, fromTop);
    classAdder.onScroll();
    scrolldelegator.addDelegate(classAdder);
    scrolldelegator.start();
  }