code: function (adContainerSettings, containerElement) {
      this.containerElement = containerElement;
      this._currentIndex = adContainerSettings.startIndex;
  
      this.childElements = Array.prototype.slice.call(this.containerElement.children);
      var interval = adContainerSettings.interval;
      if (!interval) {
          interval = this._calculateInterval(adContainerSettings.maxNumberOfAds);
      }
  
      this._startIndex = adContainerSettings.startIndex;
      this._interval = interval;
  }
docs: Created by NiekKruse on 10/19/15.
  
  Module that functions as a wrapper around the ad container element
  Containing useful functions for finding the next position in an adContainer