Private pub on heroku
You can checkout my sample chat at github https://github.com/Hareramrai/batkaro.You can also checkout private_pub server code at github https://github.com/Hareramrai/fayeserver .
If someone is looking for a more up to date answer, I just released a gem that enables real time behavior in a Rails app:
It sounds like, from the articles that you linked, that you need to have two web processes running. One for the normal web server, and one for the Faye server.
It may be easier to have two Heroku apps rather than trying to get each running within the same app.