Fix bugs:

* Can't create categories and tags
	* Recursively create directories

dynastie/templates/category.html

@@ -11,5 +11,5 @@
 {% endfor %}
 </table>
 {% endif %}
-<li><a href="/category/add">Add a category</a></li>
+<li><a href="/category/add/{{ blog.id }}">Add a category</a></li>
 {% endblock %}