Add h-entry microformat

<article class="h-entry">
  <h1 class="p-name">Microformats are amazing</h1>
  <p>Published by <a class="p-author h-card">W. Developer</a>
     on <time class="dt-published" datetime="2013-06-13 12:00:00">13<sup>th</sup> June 2013</time>
 
  <p class="p-summary">In which I extoll the virtues of using microformats.</p>
 
  <div class="e-content">
    <p>Blah blah blah</p>
  </div>
</article>