add the epochDate field to the CS RSS template. now users can use ^D(); to

create a custom date format.

docs/changelog/7.x.x.txt

@@ -1,4 +1,6 @@
 7.6.0
+ - added an epochDate field to the template for CS RSS items. The ^D();
+   macro can then format the epoch date.
  - fixed: actove admin console tab isn't highlighted
  - fixed: Folders are cached by the client too long for visitors
  - added variant id template variable to product variant loop

lib/WebGUI/Asset/Wobject/Collaboration.pm

@@ -885,6 +885,7 @@ SQL
 		    'link'          => $postUrl, 
             guid            => $postUrl,
 		    description     => $post->get('synopsis'),
+            epochDate       => $post->get('creationDate'),
 		    pubDate         => $datetime->epochToMail($post->get('creationDate')),
 		    attachmentLoop  => $attachmentLoop, 
 			userDefined1 => $post->get("userDefined1"),