plugin groupblog, XEP-0277: store both published and updated timestamps

src/plugins/plugin_misc_groupblog.py

@@ -411,6 +411,8 @@ class GroupBlog(object):
             if comments:
                 node = self.getNodeName(client.jid)
             mblog_data['id'] = str(item_id)
+            if 'published' in extra:
+                mblog_data['published'] = extra['published']
             if extra.get('allow_comments', 'False').lower() == 'true':
                 comments_node = self.host.plugins["XEP-0277"].parseCommentUrl(comments)[1]
                 # we could use comments_node directly but it's safer to rebuild it