thoughtbot/suspenders — pull request #324 by malandrina (2014-04-16 19:15:06+00:00)
Title: Update Unicorn config template

* I recently ran into an issue after deploying to Heroku where
`Rails.application.config.database_configuration[Rails.env]` was
evaluating to `nil` in the staging environment. Updating
config/unicorn.rb to the latest configuration recommended by Heroku
fixed the problem.
* Reference:
https://devcenter.heroku.com/articles/concurrency-and-database-connections#multi-process-servers