Make the bundle compatible with symfony ~2.2
Make the bundle compatible with symfony ~2.2

nicolasricci/SonataMediaBundle,vyshkant/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,vyshkant/SonataMediaBundle,bgaleotti/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,OskarStark/SonataMediaBundle,nicolasricci/SonataMediaBundle,rmzamora/SonataMediaBundle,bgaleotti/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,bgaleotti/SonataMediaBundle,bgaleotti/SonataMediaBundle,jerome-fix/SonataMediaBundle,hug963/SonataMediaBundle,jerome-fix/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,OskarStark/SonataMediaBundle,vyshkant/SonataMediaBundle,hug963/SonataMediaBundle,vyshkant/SonataMediaBundle,hug963/SonataMediaBundle,OskarStark/SonataMediaBundle,nicolasricci/SonataMediaBundle,jerome-fix/SonataMediaBundle,jerome-fix/SonataMediaBundle,vyshkant/SonataMediaBundle,sonata-project/SonataMediaBundle,hug963/SonataMediaBundle,nicolasricci/SonataMediaBundle,OskarStark/SonataMediaBundle,rmzamora/SonataMediaBundle,rmzamora/SonataMediaBundle