More accessible rss feed to the versions page. Refs #15

app/views/versions/index.haml

@@ -48,6 +48,6 @@
 = paginate @versions
 
 .formats
-  = link_to versions_path do
+  = link_to versions_path(format: :rss) do
     %em.fa.fa-rss
     = t '.feed'

app/views/versions/index.rss.builder

@@ -38,7 +38,7 @@ xml.rdf :RDF,
   @versions.each do |version|
     if version.event == 'create'
       object = version.item_type.constantize.find_by_id version.item_id
-      next unless object.moderated?
+      next unless object.try(:moderated?)
     end
     object = version.reify if object.nil?
     url = polymorphic_url(version.item_type.tableize.singularize,