Ignore query string when checking file extension

Extension checking fails when downloading a remote URL that contains a query string.

Example: http://example.com/foo.jpg?bar=baz

FileField considers the extension to be jpg?bar=baz, which doesn't match jpg.

I believe this can be fixed by altering lines 114-116 of remote.inc as follows. I havent throughly tested this, though.

$url = $item['filefield_remote']['url'];
$parsed_url = parse_url($url);
$pathinfo = pathinfo($parsed_url['path']);
$filename = rawurldecode(basename($parsed_url['path']));