Heroku Buildpack for Veritrans configuration file on Rails

Usage

• add this buildpack. heroku buildpacks:add https://github.com/Liquid-dev/heroku-buildpack-veritrans-rails.git -a app-name
• put tg_mdk.heroku.ini for production.
• when deploying, copy tg_mdk.heroku.ini to tg_mdk.ini