added whole system from ola4doc

sys/node_modules/es5-ext/array/#/keys/implement.js

@@ -0,0 +1,6 @@
+'use strict';
+
+if (!require('./is-implemented')()) {
+	Object.defineProperty(Array.prototype, 'keys', { value: require('./shim'),
+		configurable: true, enumerable: false, writable: true });
+}

sys/node_modules/es5-ext/array/#/keys/index.js

@@ -0,0 +1,4 @@
+'use strict';
+
+module.exports = require('./is-implemented')() ?
+		Array.prototype.keys : require('./shim');

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;
+};

sys/node_modules/es5-ext/array/#/keys/shim.js

@@ -0,0 +1,4 @@
+'use strict';
+
+var ArrayIterator = require('es6-iterator/array');
+module.exports = function () { return new ArrayIterator(this, 'key'); };