json function only works with PHP 5.3

in limonade.php:

function json($data, $json_option = 0)
{
   header('Content-Type: application/x-javascript; charset='.strtolower(option('encoding')));
   return json_encode($data, $json_option);
}

This fails in PHP versions prior to 5.3, where there was no second parameter to json_encode.

A simple (but ugly) fix would be:

function json($data, $json_option = 0)
{
   header('Content-Type: application/x-javascript; charset='.strtolower(option('encoding')));
   if(version_compare(PHP_VERSION, '5.3.0', '>=')) {
     return json_encode($data, $json_option);
   } else {
     return json_encode($data); 
   }
}