'load_config( self, trans, Tour_config_file, **kwd )
* GET /api/tours/{tour_id}:
Read a yaml file containing the specified tour definition
:returns:   tour definition
:rtype:     dictionary'

@expose_api_anonymous_and_sessionless
def show(self, trans, tour_id, **kwd):

    return self.app.tour_registry.tour_contents(tour_id)
