title: Groupby filter ordering
body: <p>Is it possible to make the <code>groupby</code> filter order in descending order? I have a list of dictionaries from a SQL query and I want to group by date in descending date order. From the manual:</p>
  
  <pre><code>{% for group in persons|groupby('gender') %}
      &lt;li&gt;{{ group.grouper }}&lt;ul&gt;
      {% for person in group.list %}
          &lt;li&gt;{{ person.first_name }} {{ person.last_name }}&lt;/li&gt;
      {% endfor %}&lt;/ul&gt;&lt;/li&gt;
  {% endfor %}
  </code></pre>