Release 1.3.7: fix Rails vulnerabilities.

Release 1.3.6: set a default runtime for ruby-based frameworks.

Release 1.3.5: service lifecycle extensions.

Hotfix release 1.3.4: we don't necessarily have cloudfoundry_router r…

…unning on the same node.

Release 1.3.3: improved nginx config.

Release 1.3.2: minor improvements.

Release 1.3.1: make it possible to run with a different version of ruby.

Release 1.3.0: make attributes easier to customize; more improvements…

… and fixes.

Release 1.2.0: switch to the new "initial placement" policy.

Release 1.1.3 for a runtime fix.