Merge branch 'hot-fix/README' into develop
[N/A] Test database setting for production environment

Reviewed by N/A
[N/A] Add host param in database production environment

Reviewed by N/A
[N/A] Modify Gemfile, add rspec

Reviewed by N/A
[N/A] Rollback resource scaffolds

Reviewed by N/A
[N/A] Bring back mistakenly deleted gems

Reviewed by N/A
Merge branch 'develop'