Added the underscore node_module.

node_modules/underscore/amd/clone.js

@@ -0,0 +1,11 @@
+define(['./isObject', './isArray', './extend'], function (isObject, isArray, extend) {
+
+  // Create a (shallow-cloned) duplicate of an object.
+  function clone(obj) {
+    if (!isObject(obj)) return obj;
+    return isArray(obj) ? obj.slice() : extend({}, obj);
+  }
+
+  return clone;
+
+});