Add Heroku CI

[dja]

With currently available ENV Variables.

[maxjacobson]

Hi @dja. I appreciate your PR, but I'm going to close this for now:

• we've created a new test-reporter which is language-agnostic, which makes it easier to add support for new languages and CI environments
• we recently added some Heroku CI support to that test reporter

Please give the new test-reporter a try and let us know if you have any issues: https://codeclimate.com/help