Array.prototype.forEach implementation from @Rem

Array.prototype.forEach()

// from @rem's dashboard.js: http://rem.im/chirp/dashboard.js
if (![].forEach) {
  Array.prototype.forEach = function(fn) {
    var len = this.length || 0,
    i = 0;
    context = arguments[1];

    if (typeof fn == 'function') {
      for (; i < len; i++) {
        fn.call(context, this[i], i, this);
      }
    }
  };
}