No application_controller.rb

I am attempting to remove caching and discovered this post:

How to prevent browser page caching in Rails

The problem it along with a number of other posts relating to ruby rails refer to an application_controller.rb file that my project does not have. I inherited this system so wasnt part of its initial development. Can someone explain why this would be the case? I am using padrino and in my config folder i have the following files:

• Deploy
  • production.rb
  • staging.rb
• Recipes
  • base.rb
  • nginx.rb
  • rbenv.rb
• apps.rb
• boot.rb