Passenger 5.1.6: new packages for Zesty, Debian Stretch, Nginx

Version 5.1.6 of the Passenger application server for Ruby, Node.js, Meteor and Python has been released. It features updated packages to cover an Nginx security issue. We also supply a dynamic version of the Passenger Nginx module through APT packages where possible, which is currently in the new Debian Stretch packages, as well as in replacement Ubuntu Zesty packages. The release also incorporates a few improvements and fixes, such as graceful shutdown for Passenger Standalone with the Nginx engine.