Perform some cleanup using php-cs-fixer

$ php-cs-fixer --verbose fix examples/
   1) event-dispatcher/event-dispatcher.php (function_declaration)
   2) event-handling/event-handling.php (new_with_braces)
   3) event-sourced-domain-with-tests/Invites.php (extra_empty_lines)

$ php-cs-fixer --verbose fix src/
   1) Broadway/EventSourcing/AggregateFactory/AggregateFactoryInterface.php (phpdoc_params)
   2) Broadway/EventSourcing/AggregateFactory/NamedConstructorAggregateFactory.php (unused_use)
   3) Broadway/EventSourcing/AggregateFactory/PublicConstructorAggregateFactory.php (new_with_braces)
   4) Broadway/EventSourcing/EventSourcingRepository.php (return)

$ php-cs-fixer --verbose fix test/
   1) Broadway/Auditing/CommandSerializerTest.php (visibility)
   2) Broadway/EventSourcing/AbstractEventSourcingRepositoryTest.php (unused_use)
   3) Broadway/EventSourcing/EventSourcingRepositoryTest.php (extra_empty_lines, new_with_braces)
   4) Broadway/Saga/Metadata/MetadataTest.php (unused_use, function_declaration)
   5) Broadway/Saga/Metadata/StaticallyConfiguredSagaMetadataFactoryTest.php (function_declaration)
   6) Broadway/Saga/MultipleSagaManagerTest.php (function_declaration)
   7) Broadway/Saga/State/CriteriaTest.php (psr0)
   8) Broadway/Saga/State/MongoDBRepositoryTest.php (function_declaration)