add config middleware

@@ -13,6 +13,10 @@ var app = express();
 // set view engin
 var doraemon = path.join(__dirname, '../../doraemon/views'); // parent view root
 
+app.on('mount', function(parent) {
+    delete parent.locals.settings; // 不继承父 App 的设置
+    Object.assign(app.locals, parent.locals);
+});
 app.set('views', path.join(__dirname, 'views/action'));
 app.engine('.hbs', hbs({
     extname: '.hbs',