Force escape on title in Atom feed

Signed-off-by: Julien Danjou <julien@danjou.info>

hyde/layouts/basic/layout/atom.j2

@@ -21,7 +21,7 @@
 
     {% for res in resource.node.walk_resources_sorted_by_time() %}
         <entry>
-            <title type="html">{{ res.meta.title }}</title>
+            <title type="html">{{ res.meta.title|forceescape }}</title>
             <author><name>{{ res.meta.author }}</name></author>
             <link href="{{ content_url(res.url) }}"/>
             <updated>{{ res.meta.created|xmldatetime }}</updated>
@@ -46,4 +46,4 @@
             </content>
         </entry>
     {% endfor %}
-</feed>
+</feed>