message: fix for properly matching / excluding events in fb
diff: @@ -512,7 +512,8 @@ function Facebookbot(configuration) {
  // loop through all active conversations this bot is having
  // and mark messages in conversations as delivered = true
  - bot.findConversation(message, function(convo) {
  + // note: we don't pass the real event in here because message_delivered events are excluded from conversations and won't ever match!
  + bot.findConversation({user: message.user}, function(convo) {
  if (convo) {
  for (var s = 0; s < convo.sent.length; s++) {
  if (convo.sent[s].sent_timestamp <= message.delivery.watermark ||
  