Rename test files to test_.
Add Honcho (foreman alternative in Python) file(s).

The reason we have both Procfile and Honchofile is to be able to run both the workers and the web server in a single dyno on Heroku.
Read settings from environment variables instead of a settings file.

This is mostly done to make it easier to run re:dash on Heroku but should be convenient in other platforms too.
Fix: allow passing relative path for assets.
Bump version.
Example .env file.
Fix CircleCI configuration
Merge pull request #93 from EverythingMe/feature_env

Feature: better Heroku support - move configuration to environment variables & Procfile