Optional parameter for passing in $path_info to Toro

The regular .htaccess for ToroPHP didn't work at my webhost so had to pass the path_info as a get parameter instead, like this:

    RewriteRule .* index.php?toro_uri=/$0 [PT,L,QSA]

Toro of course doesn't know about that, so I figured it would be nice if you could optionally pass in your own path_info like this:

    Toro::serve(array(
        "/" => "Controller_Home",
    ), isset($_GET['toro_uri']) ? $_GET['toro_uri'] : NULL);

And with this change you can :)