disqus_identifier param is not used

Author: daattali

_layouts/post.html

@@ -13,5 +13,5 @@ <h1>{{ page.title }}</h1>
     Written on {{ page.date | date: "%B %e, %Y" }}
   </div>
 
-  {% include disqus.html disqus_identifier=page.disqus_identifier %}
-</article>
+  {% include disqus.html %}
+</article>