Remove rbenv-ruby 1.9.3-p545
Remove rbenv-ruby 1.9.3-p545

This was removed from app servers and the dev VM a while ago.

boffbowsh/ci-puppet,boffbowsh/ci-puppet,alphagov/ci-puppet,boffbowsh/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,boffbowsh/ci-puppet