Fix for baseurl problem in posts_by_category

Fixes issue codeasashu#5.

_layouts/posts_by_category.html

@@ -41,7 +41,7 @@ <h1 id="post-subtitle">Articles by category: <em class="text-muted">{{ page.cate
                 {% endif %}
             {% endif %}
             <div class="least-content">{{ post.date | date_to_string }}</div>
-            <h4 class="list-group-item-heading"><a href="{{ post.url }}">{{ post.title }}</a></h4>
+            <h4 class="list-group-item-heading"><a href="{{ site.baseurl }}/{{ post.url }}">{{ post.title }}</a></h4>
             <p class="list-group-item-text">{{ post.content | strip_html | truncatewords: 20 }}</p>
 
             </div>
@@ -53,4 +53,4 @@ <h4 class="list-group-item-heading"><a href="{{ post.url }}">{{ post.title }}</a
         <p>There are no posts in this categories.</p>
     {% endif %}
 </div>
-</div>
+</div>