Added ianblenke/docker-huginn as docker/ subdirectory, moved Dockerfile out of the root and renamed as Dockerfile.rbenv
Changing the maintainer email in the Dockerfile
Changing the Maintainer to just Andrew Cantino
Fix github project name in docker/README.md
Refactored the environment variables to use a HUGINN_ prefix
Refactoring the sourcing of .env.example as the driver for the generated .env
Merge pull request #496 from ianblenke/replace-dockerfile

Added ianblenke/docker-huginn as docker/ subdirectory