code: function(event, selector, handler, fn) {
        if (/^f/.test(typeof selector)) {
          handler = selector;
        }
        fn = handler;
        return this.each(function(index, el) {
          var events = event.split(' ');
          u.each(events, function(i, event, origEvent){
            origEvent = u._events.remove(el, event, fn);
            handler = origEvent.length ? origEvent[0].handler : handler;
            el.removeEventListener(event, handler);
          });
        });
      }
docs: off method
  remove event listeners from elements
  @param  {string}   event   - event type i.e 'click'
  @param  {function} handler - event handler function
  @return {object}   this