fix related posts ordering due to Jekyll bug

Will be fixed in Jekyll v1.0.4; until then do this workaround.

jekyll/jekyll#1240

_layouts/post.html

@@ -35,11 +35,14 @@ <h1 class=entry-title>{{ page.title }}</h1>
   <h2>Also on this site</h2>
 
   <ol class="posts">
-    {% for post in site.related_posts limit:3 %}
+    {% for related in site.posts %}
+      {% if related.url != page.url and related.link == null and (void == null or void != '2') %}
       <li>
-        <span class="date">{{ post.date | date_to_string }}</span>
-        ▸ <a href="{{ post.url }}">{{ post.title }}</a>
+        <span class="date">{{ related.date | date_to_string }}</span>
+        ▸ <a href="{{ related.url }}">{{ related.title }}</a>
       </li>
+      {% capture void %}{% increment related_shown %}{% endcapture %}
+      {% endif %}
     {% endfor %}
   </ol>
   {% endunless %}