Builtin 'plugin' now works

node/test.js

@@ -0,0 +1,5 @@
+exports.expressServer = function (hook_name, args, cb) {
+  args.app.get('/testxx', function(req, res) { 
+      res.send("<em>Testing testing</em>");
+  });
+}

pluginomatic.json

@@ -1,6 +1,8 @@
 {
   "parts": [{
     "name": "__builtin__",
-    "hooks": {}
+    "hooks": {
+      "expressServer": "../test:expressServer"
+    }
  }]
 }