title: Mongoose Trying to open unclosed connection
body: <p>This is a simplified version of the problem, but basically I'm trying to open 2 mongodb connections with mongoose and it's giving me "Trying to open unclosed connection." error.</p>
  
  <p>Code sample:</p>
  
  <pre><code>var db1 = require('mongoose');
  db1.connect('my.db.ip.address', 'my-db');
  
  var db2 = require('mongoose');
  db2.connect('my.db.ip.address', 'my-db');
  
  db2.connection.close();
  db1.connection.close();
  </code></pre>
  
  <p>Any idea how to make it work?</p>