rbenv:validate is now a 'success' if a Ruby version exists.
rbenv:validate is now a 'success' if a Ruby version exists.

Also, 'exit 1' is not needed as the correct exit value is set by the
[ -d $dir ] query.

capistrano/rbenv,ta1kt0me/rbenv,l8nite/capistrano-ndenv,kewaunited/rbenv