title: Using $inc to increment a document property with Mongoose
body: <p>I would like to increment the <code>views</code> count by 1 each time my document is accessed. So far, my code is:</p>
  
  <pre><code>Document
      .find({})
      .sort('date', -1)
      .limit(limit)
      .exec();
  </code></pre>
  
  <p>Where does <code>$inc</code> fit in here?</p>