implemented #461 "Ehanced level of detail for changes RSS feed".

Needs to verify if plain text is formatted like <pre>.


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3148 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/FeedAdapter.java

@@ -26,6 +26,12 @@ public interface FeedAdapter<E> {
      */
     String getEntryID(E entry);
 
+    /**
+     * (Potentially lengthy) plain text to be attached to the feed.
+     * Can be null.
+     */
+    String getEntryDescription(E entry);
+
     /**
      * Timestamp of the last change in this entry.
      */