title: A html string is escaped in haml file
body: <pre><code>#test
    - html = "&lt;a href='http://www.a.com'&gt;Test&lt;/a&gt;"
    = html
  </code></pre>
  
  <p>The output is </p>
  
  <pre><code>&lt;div id='test'&gt;
    &amp;lt;a href='http://www.a.com'&amp;gt;Test&amp;lt;/a&amp;gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>But I want a output:</p>
  
  <pre><code>&lt;div id='test'&gt;
    &lt;a href='http://www.a.com'&gt;Test&lt;/a&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Anyone has solutions? Thanks.</p>