Create and retreive secure notes.
$ mkdir notes-service && tar xzf notes-service.tar.gz -C notes-service
$ cd notes-service && bundle
$ bundle exec ruby app.rb
$ curl --data "title=title;text=text;password=secret" localhost:4567/notes
{"id":"eb9b2050-3745-0132-5d6b-081fa104c5e2"}
$ curl "localhost:4567/notes/2231d6b0-369f-0132-5d6a-081fa104c5e2?password=secret"
{"title":"title","text":"text","id":"2231d6b0-369f-0132-5d6a-081fa104c5e2"}
$ bundle exec rspec