added whole system from ola4doc

sys/node_modules/arr-flatten/index.js

@@ -0,0 +1,27 @@
+/*!
+ * arr-flatten <https://github.com/jonschlinkert/arr-flatten>
+ *
+ * Copyright (c) 2014-2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function flatten(arr) {
+  return flat(arr, []);
+};
+
+function flat(arr, res) {
+  var len = arr.length;
+  var i = -1;
+
+  while (len--) {
+    var cur = arr[++i];
+    if (Array.isArray(cur)) {
+      flat(cur, res);
+    } else {
+      res.push(cur);
+    }
+  }
+  return res;
+}