added whole system from ola4doc

sys/node_modules/es5-ext/array/#/flatten.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var isArray = Array.isArray, forEach = Array.prototype.forEach;
+
+module.exports = function flatten() {
+	var r = [];
+	forEach.call(this, function (x) {
+		if (isArray(x)) {
+			r = r.concat(flatten.call(x));
+		} else {
+			r.push(x);
+		}
+	});
+	return r;
+};