message: Add fields pertaining to ephemeral messages to format
diff: @@ -470,6 +470,11 @@ function Slackbot(configuration) {
  platform_message.icon_url = message.icon_url || null;
  platform_message.icon_emoji = message.icon_emoji || null;
  + // should this message be sent as an ephemeral message
  + if (message.ephemeral) {
  + platform_message.ephemeral = true;
  + platform_message.user = message.user;
  + }
  if (platform_message.icon_url || platform_message.icon_emoji || platform_message.username) {
  platform_message.as_user = false;
  