Fixed links.

_pages/sitemap.html

@@ -21,7 +21,7 @@ permalink: /sitemap/
 <ul>
 {% for post in site_posts %}
     <li>
-        <a href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a>
+        <a href="{{ post.url | prepend: site.baseurl }}.html">{{ post.title }}</a>
     </li>
 {% endfor %}
 </ul>

_pages/tags.md

@@ -16,7 +16,7 @@ permalink: /tags/
    {% assign tag_name = tag | first %}
    {% for post in site.tags[tag_name] %}
         <li>
-            <a href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a>
+            <a href="{{ post.url | prepend: site.baseurl }}.html">{{ post.title }}</a>
         </li>
    {% endfor %}
     </ul>