added a default implementation of the ManagerRegistry integrating the container
added a default implementation of the ManagerRegistry integrating the container

attempted to maintain BC as good as possible, but RegistryInterface::getRepository() had to be dropped from RegistryInterface. Its still part of the ManagerRegistry, so its only a BC break for people using RegistryInterface to create their own implementation

javiereguiluz/DoctrineBundle,nicolas-grekas/DoctrineBundle,doctrine/DoctrineBundle,lafourchette/DoctrineBundle,hason/DoctrineBundle,dunglas/DoctrineBundle,Soullivaneuh/DoctrineBundle,skafandri/DoctrineBundle,mikeSimonson/DoctrineBundle,OskarStark/DoctrineBundle,fervo/DoctrineBundle,fabpot/DoctrineBundle,hason/DoctrineBundle,hacfi/DoctrineBundle,stof/DoctrineBundle,nicolas-grekas/DoctrineBundle,gencer/DoctrineBundle,skafandri/DoctrineBundle,chrisguitarguy/DoctrineBundle,gencer/DoctrineBundle,OskarStark/DoctrineBundle,javiereguiluz/DoctrineBundle,fervo/DoctrineBundle,Soullivaneuh/DoctrineBundle,chrisguitarguy/DoctrineBundle,fabpot/DoctrineBundle,mikeSimonson/DoctrineBundle,hacfi/DoctrineBundle