Added the underscore node_module.

node_modules/underscore/amd/_deepGet.js

@@ -0,0 +1,15 @@
+define(function () {
+
+  // Internal function to obtain a nested property in `obj` along `path`.
+  function deepGet(obj, path) {
+    var length = path.length;
+    for (var i = 0; i < length; i++) {
+      if (obj == null) return void 0;
+      obj = obj[path[i]];
+    }
+    return length ? obj : void 0;
+  }
+
+  return deepGet;
+
+});