Automatically try to re-connect to MongoDB every 5 seconds in case of connection.error

app.js

@@ -34,6 +34,9 @@ var passportConf = require('./config/passport');
 mongoose.connect(secrets.db);
 mongoose.connection.on('error', function() {
   console.log('✗ MongoDB Connection Error. Please make sure MongoDB is running.'.red);
+  setTimeout(function() {
+    mongoose.connect(secrets.db);
+  }, 5000);
 });
 
 var app = express();