message: Added error logging for say and spawn.run
diff: @@ -1028,15 +1028,21 @@ function Botkit(configuration) {
  // mutate the worker so that we can call middleware
  worker.say = function(message, cb) {
  botkit.middleware.send.run(worker, message, function(err, worker, message) {
  + if (err) {
  + botkit.log('Error in worker.say: ' + err);
  + } else {
  worker.send(message, cb);
  + }
  });
  };
  botkit.middleware.spawn.run(worker, function(err, worker) {
  -
  + if (err) {
  + botkit.log('Error in middlware.spawn.run: ' + err);
  + } else {
  botkit.trigger('spawned', [worker]);
  if (cb) { cb(worker); }
  -
  + }
  });
  return worker;
  