Added the underscore node_module.

node_modules/underscore/modules/defer.js

@@ -0,0 +1,7 @@
+import partial from './partial.js';
+import delay from './delay.js';
+import _ from './underscore.js';
+
+// Defers a function, scheduling it to run after the current call stack has
+// cleared.
+export default partial(delay, _, 1);