Add procfile back to source control, otherwise unable to push to heroku.
Make first argument of process the port of the http server - for Heroku.
Add debug message that prints the port on which http server is running
Add .env file and capability to read username and password from environment - Heroku
Make http port setting much more elegant.
Slight modification of procfile
Rename procfile -> Procfile
Repair environment/json username setting to work on heroku.