/**
 *
 * Scanner::timeout
 *
 * Get the maximum amount of milliseconds the slave can take to serve one file. 
 *
 * If a slave takes more than this amount of milliseconds, it will be killed and the scanner will continue with the next file.
 *
 * * return The timeout in milliseconds, or -1 on error
 *
 */
static VALUE scanner_get_slave_timeout(VALUE self) {