Heroku production version: all 14 chapters completed (no mail server)

For the production version, I completed all 14 chapters of Michael Hartl's Ruby on Rails tutorial (https://www.railstutorial.org/) on July 31, 2017. The chapter 11 and 12 are skipped, so the email server is disabled.

The source code of the project is:
https://github.com/jimmy2046/sample_app_heroku_2

The URL hosting address of Heroku production is:
https://warm-ravine-91766.herokuapp.com/