Tacking forEach onto NodeList to reduce annoyance at it being different from [].

NodeList.forEach.js

NodeList.prototype.forEach = function nodeListEach(callback, thisArg) {
  for (var i = 0; i < this.length; ++i) {
    var value = this[i];
    if (thisArg) {
      callback.bind(thisArg)(value, i, this);
    }
    else {
      callback(value, i, this);
    }
  }
};