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https://github.com/heroku/heroku-accounts
https://stackoverflow.com/questions/13140375/heroku-toolbelt-switch-between-multiple-account
https://devcenter.heroku.com/articles/authentication
https://devcenter.heroku.com/articles/using-the-cli
http://www.marinamele.com/2014/02/how-to-access-multiple-heroku-accounts.html
https://michaelsoolee.com/multiple-heroku-accounts/
https://railsware.com/blog/2013/02/05/how-to-set-up-the-heroku-tools-for-deployment-with-multiple-accounts/
https://trailhead.salesforce.com/en/content/learn/modules/salesforce_heroku_integration/getting_started_with_integration
https://docs.newrelic.com/docs/accounts/install-new-relic/partner-based-installation/heroku-install-new-relic-add
http://docs.railsbridge.org/installfest/create_a_heroku_account
https://community.atlassian.com/t5/Bitbucket-questions/How-to-deploy-different-branches-to-different-Heroku-apps-via/qaq-p/859707
https://medium.freecodecamp.org/the-beauty-of-heroku-connect-simplifying-database-synchronization-e57451d3b376
https://guides.railsgirls.com/heroku