code: def bind_(cls, kls):
          
          if not hasattr(kls, "__call__"):
              raise TypeError("From Pylot.bind_: '%s' is not callable" % kls)
          cls._bind.add(kls)
          return kls
docs: To bind application that needs the 'app' object to init
          :param app: callable function that will receive 'Flask.app' as first arg