Fix assets on heroku.
Fix assets on heroku.
Fix assets on Heroku.
Remove precompile assets.
Fix assets on Heroku.
Fix assets on Heroku.
Fix assets on Heroku.
Give up on Heroku assets for now.

I don't see any reason why application.css is empty
after Heroku executes rake assets:precompile. I can
precompile before committing but then the project
will become unnecessarily bloated. I think I should
investigate using a CDN for assets, which Heroku
recommends.