in commit 735e9a4 add use filesystem

wrong way to generate parent dir - not use '../' to up parent, use dirname
current is broken Sensio - generate:bundle - it create bundle in app/cache/dev/../src

old value is
'kernel.root_dir' => '/home/ivan/projects/qs/app',
new
'kernel.root_dir' => __DIR__.'/../..',
need
'kernel.root_dir' => dirname(dirname(__DIR__)),

or some other solution