added whole system from ola4doc

sys/node_modules/es6-iterator/valid-iterable.js

@@ -0,0 +1,8 @@
+'use strict';
+
+var isIterable = require('./is-iterable');
+
+module.exports = function (value) {
+	if (!isIterable(value)) throw new TypeError(value + " is not iterable");
+	return value;
+};