title: Exclude fields from result in MongoDB monk
body: <p>I want to exclude some fields from result.
  I have code:</p>
  
  <pre><code>users = db.select('users');
  
  users.find( {}, { sort: { points:1 }, privateKey:0, publicKey:0}, function(err,data){      
    res.send(data);
  });
  </code></pre>
  
  <p>I want to exclude private and public key from results.
  Can I do that using monk?</p>