Change validation.xml to work with symfony ~2.2
Change validation.xml to work with symfony ~2.2

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