forgot to add the extratokens variable to the serve function

Added $extratokens to the server() fuction.

Sample usage:
    Toro::serve(array(
                "/"                              => "MainPageHandler",
                "/users"                      => "UsersHandlerShow",
                "/users/:userid/edit"     => "UsersHandlerEdit",
                ), array(':userid' => CurrentUserID())); // CurrentUserID() in this case returns the userid of the currently logged in user.