AddThis support.

templates/article.html

@@ -15,6 +15,9 @@
     <h2 id="{{ article.slug }}">{{ article.title }}</h2>
     <p>Posted on {{ article.locale_date }} in <a href="{{ SITEURL }}/{{ article.category.url }}">{{ article.category }}</a></p>
   </header>
+  {% if ADD_THIS_ID %}
+  <div class="addthis_sharing_toolbox"></div>
+  {% endif %}
   <div>
     {{ article.content }}
   </div>