A week of symfony #580 (5-11 February 2018)

This week, the upcoming Symfony 4.1 version added support for immutable dates in forms, added new output formats for the workflow:dump command and added support for hasser methods in PropertyInfo. In addition, work continued to make Symfony builds reproducible and to improve the Routing performance. Symfony development highlights 2.7 changelog: 12447d9: [Form] keep the context…