[DependencyInjection] optimized compiled containers
[DependencyInjection] optimized compiled containers

 * removed the __call() method in Container: it means that now, there is only
   one way to get a service: via the get() method;

 * removed the $shared variable in the dumped Container classes (we now use
   the $services variable from the parent class directly -- this is where we
   have a performance improvement);

 * optimized the PHP Dumper output.

juchi/DoctrineMongoDBBundle,tomasbro/DoctrineMongoDBBundle,juchi/DoctrineMongoDBBundle,doctrine/DoctrineMongoDBBundle,0mars/DoctrineMongoDBBundle,malarzm/DoctrineMongoDBBundle,jahller/DoctrineMongoDBBundle,alcaeus/DoctrineMongoDBBundle,castarco/DoctrineMongoDBBundle,alcaeus/DoctrineMongoDBBundle,jahller/DoctrineMongoDBBundle,tomasbro/DoctrineMongoDBBundle,castarco/DoctrineMongoDBBundle,0mars/DoctrineMongoDBBundle,sarcher/DoctrineMongoDBBundle,Soullivaneuh/DoctrineMongoDBBundle,stof/DoctrineMongoDBBundle,Soullivaneuh/DoctrineMongoDBBundle,malarzm/DoctrineMongoDBBundle