Added the underscore node_module.

node_modules/underscore/amd/after.js

@@ -0,0 +1,14 @@
+define(function () {
+
+  // Returns a function that will only be executed on and after the Nth call.
+  function after(times, func) {
+    return function() {
+      if (--times < 1) {
+        return func.apply(this, arguments);
+      }
+    };
+  }
+
+  return after;
+
+});