Added the underscore node_module.

node_modules/underscore/modules/after.js

@@ -0,0 +1,8 @@
+// Returns a function that will only be executed on and after the Nth call.
+export default function after(times, func) {
+  return function() {
+    if (--times < 1) {
+      return func.apply(this, arguments);
+    }
+  };
+}