Use a single email address for sending mails.
Use environment variables for production secrets...

... so no need for copying the example file.
Use environment variables for production config...

... so no need for example config.
Use environment variable for production database...

... so no need for copying the example file.
Enable external SMTP server if necessary, via environment vars.
Fixup instructions for using default configs in development, environment vars in production.
Enable Unicorn as a production web server.

Conflicts:
	Gemfile
Ignore .env
logo, 1st draft
Add heroku app definition
Add 'Deploy to Heroku' button and instructions.