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.