Which basically achieves the live streaming of data using ActionController::Live.
Check out the Directory Structure to know the differences introduced in Rails 4.
I have used a local copy of Rails 4 Project to develop this project.
So you can clone it from github.com/rails/rails
And provide your local path in the Gemfile as
gem 'rails', path: '/Path/To/Your/Rails4/
That's it. You are good to Go clone and Run this Project to see the awesomeness of ActionController::Live :)
Interested in Exploring More Awesome Features in Rails 4 ?
You can Check out my repo on 'Strong Parameters' in Rails 4. Here github.com/rShetty/Strong-Parameters
Feel free to write me at firstname.lastname@example.org for any queries and updates.