Add resource revisions to the timeline and add proper templates and

rendering for resources and resource revisions (this is needed later
on for the taxonomy).
Directly link to individual resource / page revisions from the timeline
as well.

src/IDF/templates/idf/wiki/feedfragment-page.xml

@@ -1,4 +1,4 @@
-<entry>
+ <entry>
    <title>{$title}</title>
    <link href="{$url}"/>
    <id>{$url}:{$rev.id}</id>

src/IDF/templates/idf/wiki/feedfragment-resource.xml

@@ -0,0 +1,11 @@
+ <entry>
+   <title>{$title}</title>
+   <link href="{$url}"/>
+   <id>{$url}:{$rev.id}</id>
+   <updated>{$date}</updated>
+   <author>{$rev.get_submitter()}</author>
+   <content type="xhtml"><div xmlns="http://www.w3.org/1999/xhtml">
+{if !$create}<p><strong>{trans 'Changes:'}</strong> {$rev.summary}</p>
+{else}{trans 'Initial creation'}{/if}
+</div></content>
+</entry>