code: function(nodeList, newTagName) {
      for (var i = nodeList.length - 1; i >= 0; i--) {
        var node = nodeList[i];
        this._setNodeTag(node, newTagName);
      }
    }
docs: Iterates over a NodeList, and calls _setNodeTag for each node.
  
  @param NodeList nodeList The nodes to operate on
  @param String newTagName the new tag name to use
  @return void