new Travis job for testing with latest dev dependencies (#646)
new Travis job for testing with latest dev dependencies (#646)

(to show current issues with Symfony 3.3-dev)
fabpot/DoctrineBundle,OskarStark/DoctrineBundle,mikeSimonson/DoctrineBundle,fervo/DoctrineBundle,fervo/DoctrineBundle,gencer/DoctrineBundle,mikeSimonson/DoctrineBundle,OskarStark/DoctrineBundle,gencer/DoctrineBundle,fabpot/DoctrineBundle,doctrine/DoctrineBundle,nicolas-grekas/DoctrineBundle,nicolas-grekas/DoctrineBundle