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

sonata-project/SonataPageBundle,Th3Mouk/SonataPageBundle,Aylarius/SonataPageBundle,Dunduro/SonataPageBundle,grimpows/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,Aylarius/SonataPageBundle,Dunduro/SonataPageBundle,Dunduro/SonataPageBundle,grimpows/SonataPageBundle,Th3Mouk/SonataPageBundle,Th3Mouk/SonataPageBundle,Dunduro/SonataPageBundle,grimpows/SonataPageBundle,Th3Mouk/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,sonata-project/SonataPageBundle,Aylarius/SonataPageBundle,Dunduro/SonataPageBundle