thoughtbot/suspenders — pull request #239 by jferris (2013-12-05 18:52:13+00:00)
Title: Move secret key out of version control

* Use environment variables
* Set dummy value for development
* Automatically generate values for new Heroku apps

More information:
http://blog.codeclimate.com/blog/2013/03/27/rails-insecure-defaults/