docs: def message (self, say_obj, to, **options):
          """
          A shortcut method to create a session, say something, and hang up, all in one step. This is particularly useful for sending out a quick SMS or IM.
          Argument: "say_obj" is a Say object
          Argument: "to" is a String
          Argument: **options is a set of optional keyword arguments.
          See https://www.tropo.com/docs/webapi/message
          """
          if isinstance(say_obj, basestring):
              say = Say(say_obj).obj
          else:
              say = say_obj
          self._steps.append(Message(say, to, **options).obj)