Method saveNewRoad

* Saves new road into database with given data * * Note that this method does NOT check if a hash is safe to overwrite before * running. * * @param string $hash a string of the road hash to check * @param string $athena a string of the user's username. '' if none. * @param string $classes a string of the class list of the road-to-be-saved * @param string $majors a stri

($hash, $athena, $classes, $majors)