fix $app->error() number of callback arguments
fix $app->error() number of callback arguments

Silex\Application::error($callback) - $callback accepts 3 arguments: \Exception $e, Request $request, $code
agusbussi03/elecciones,marius-rizac/Silex-Skeleton,javal1983/silex-scrapbook,cesarAugusto1994/blog3,cesarAugusto1994/report,silexphp/Silex-Skeleton,agusbussi03/elecciones,cesarAugusto1994/blog3,marius-rizac/Silex-Skeleton,cesarAugusto1994/blog3,silexphp/Silex-Skeleton,cesarAugusto1994/report,javal1983/silex-scrapbook,cesarAugusto1994/report,agusbussi03/elecciones