Change FOS userprovider for FOSUserBundle v2

https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Upgrade.md
Change FOS userprovider for FOSUserBundle v2 (singlelang)

https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Upgrade.md
Merge pull request #103 from Kunstmaan/fix_security_fosuserbundle_23

Fix security fosuserbundle 23