added whole system from ola4doc

sys/node_modules/es5-ext/array/#/keys/is-implemented.js

@@ -0,0 +1,14 @@
+'use strict';
+
+module.exports = function () {
+	var arr = [1, 'foo'], iterator, result;
+	if (typeof arr.keys !== 'function') return false;
+	iterator = arr.keys();
+	if (!iterator) return false;
+	if (typeof iterator.next !== 'function') return false;
+	result = iterator.next();
+	if (!result) return false;
+	if (result.value !== 0) return false;
+	if (result.done !== false) return false;
+	return true;
+};