add disqus and show adsense only on posts

_layouts/post.html

@@ -6,4 +6,8 @@ layout: default
   <h1 class="post-title">{{ page.title }}</h1>
   <time datetime="{{ page.date | date_to_xmlschema }}" class="post-date">{{ page.date | date_to_string }}</time>
   {{ content }}
+
+  {% include google_adsense.html %}
+
+  {% include disqus.html %}
 </article>