Let Resque_Worker::updateProcLine() use PHP 5.5's cli_set_process_title() if available

updateProcLine() uses the PECL function setproctitle() if available. It should also try to use cli_set_process_title(), available in PHP 5.5.

cli_set_process_title() is preferred because setproctitle() is "incomplete and might lead to memory corruption on Linux". (See https://wiki.php.net/rfc/cli_process_title )