Added the underscore node_module.

node_modules/underscore/amd/_shallowProperty.js

@@ -0,0 +1,12 @@
+define(function () {
+
+  // Internal helper to generate a function to obtain property `key` from `obj`.
+  function shallowProperty(key) {
+    return function(obj) {
+      return obj == null ? void 0 : obj[key];
+    };
+  }
+
+  return shallowProperty;
+
+});