code: function(element, before) {
          element = element.get ? element.get('element') : element;
          before = (before && before.get) ? before.get('element') : before;
          
          return this.get('element').insertBefore(element, before);
      }
docs: Wrapper for HTMLElement method.
  @method insertBefore
  @param {HTMLElement} element The HTMLElement to insert
  @param {HTMLElement} before The HTMLElement to insert
  the element before.
  @return {HTMLElement} The inserted DOM element.