Assets precompilation

Before deploying to production you may wannna change asses precompiling option.
By default it's set to "false" and assume user will precompile it.
  config.assets.digest = true

To compile assets run following command on terminal:

bundle exec rake assets:precompile

Reference:

http://stackoverflow.com/questions/7275636/rails-3-1-0-actionviewtemplateerrror-application-css-isnt-precompiled