Get the fingerprint of the package signing GPG key from the key file on disk
Merge branch 'master' of github.com:rubygems/rubygems-infrastructure

* 'master' of github.com:rubygems/rubygems-infrastructure:
  cleanup
  hide the rake tasks we aren’t using for now
  Reload on ulimit changes
  Metadata version bump
  Explicitly set the source
  Fix nginx's ulimit
  add client_max_body_size to balancer config
  add postfix to app server
  fix slack sensu handler
  add directory for use in maintenance mode