"Popular threads" widget integration

[lolautruche]

The widget Popular threads should be integrated as a separated template that could be included from anywhere.

<div id="popularthreads" class="dsq-widget">
    <h2 class="dsq-widget-title">Popular Threads</h2>
    <script type="text/javascript" src="http://<disqus_shortname>.disqus.com/popular_threads_widget.js?num_items=5"></script>
</div>
<a href="http://disqus.com/">Powered by Disqus</a>

Following parameters should be configurable :

• num_items