Rails - Mar 2013 - Does anyone know what is causing auto-generated config.rb file for stylesheets?

Recently a particular Rails app I''m working with began to auto-generate
a
file app/assets/stylesheets/config.rb. It looks similar to a Compass 
configuration file, but this app does _not_ use Compass.

I''ve found a couple threads about this, but so far no answers.
http://stackoverflow.com/questions/15003841/rails-assets-stylesheets-config-rb
https://github.com/rails/sass-rails/issues/141

Some relevant info about the app''s gems:
    rails (3.2.12)
    sass (3.2.6)
    sass-rails (3.2.5)
    sprockets (2.2.2)

Most of all I want to know why the file is now appearing and why it is 
important. Should I just git-ignore it? Is it best to add the file to 
version control?

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