title: bootstrap alert fade class does not display
body: <p>I have this code in <a href="http://plnkr.co/edit/b0kp65zZoAn12D1LrotZ" rel="nofollow">http://plnkr.co/edit/b0kp65zZoAn12D1LrotZ</a>.</p>
  
  <p>Why, if I add the <code>fade</code> class, won’t the text display? I just want to show an alert message and fade after a time. Any idea what’s wrong with this code?</p>
  
  <pre><code>&lt;div class="alert fade" bs-alert&gt;&lt;strong&gt;Hey!&lt;/strong&gt; This is a static alert.&lt;/div&gt;
  </code></pre>