Uglifier on 3.1

I'm having trouble with my JS/CoffeeScripts not being minified for production. Both my jQuery and my individual .coffee files are being sent as full-text JS both locally (on WEBrick, Thin and Unicorn) in production mode and when deployed to Heroku (using Unicorn). rake assets:precompile is not minifying the output. Here are my Gemfile, application.rb and production.rb:

If there's anything else you need to know, I'll be happy to provide it.