title: res.cookie doesn't set any cookies
body: <p>I was messing around with express and cookies. I used the cookie-parser example in the repository and <code>req.cookies</code> works perfectly, but when I try to use <code>res.cookie(name,value)</code> it doesn't set anything. It doesn't even give me an error.</p>
  
  <p>Here's my code:</p>
  
  <pre><code>var express      = require('express')
  var cookieParser = require('cookie-parser')
  
  var app = express()
  app.use(cookieParser())
  
  app.get('/', function(req, res) {
    res.cookie('rememberme',1);
    console.log('Cookies: ', req.cookies)
  });
  
  app.listen(8080)
  </code></pre>