def authenticate(username, password, method = :plain)
      execute(MarilynRPC::Service::AUTHENTICATION_PATH,
              "authenticate_#{method}".to_sym, [username, password])
    end
def authenticate(username, password, method = :plain)
      execute(MarilynRPC::Service::AUTHENTICATION_PATH,
              "authenticate_#{method}".to_sym, [username, password])
    end
authenicate the client to call methods that require authentication
 @param [String] username the username of the client
 @param [String] password the password of the client
 @param [Symbol] method the method to use for authentication, currently
   only plain is supported. So make sure you are using a secure socket.