A week of symfony #589 (9-15 April 2018)

This week, Symfony continued working on the new features of the upcoming 4.1 version, such as iterable support in the SymfonyStyle methods and a new AMQP adapter for the Messenger component. In addition, we opened the Call for Papers for SymfonyLive London 2018 conference. Symfony development highlights 2.7 changelog: 0f9c45e: [Validator] fixed LazyLoadingMetadataFactory with PSR6Cache…