mail_gateway: [Fix] Add date missing in history call

bzr revid: sbh@tinyerp.com-20101119092225-esluz8td3sqfq1er

addons/mail_gateway/mail_gateway.py

@@ -568,6 +568,7 @@ class mailgate_tool(osv.osv_memory):
                             message_id = msg.get('message-id'),
                             references = msg.get('references', False) or msg.get('in-reply-to', False),
                             attach = attachments.items(),
+                            email_date = msg.get('date'),
                             context = context)
         else:
             self.history(cr, uid, model, res_ids, msg, attachment_ids, context=context)