Returns the route base to use for the current class.

def get_base_route(cls):
        """Returns the route base to use for the current class."""
        base_route = cls.__name__.lower()
        if cls.base_route is not None:
            base_route = cls.base_route
            base_rule = parse_rule(base_route)
            cls.base_args = [r[2] for r in base_rule]
        return base_route.strip("/")