update db config
Do not use SSL for rubygems.org (less headaches)
Remplace thin gem by unicorn
Base Unicorn configuration for Rails

Copied from https://blog.heroku.com/archives/2013/2/27/unicorn_rails
Fix typo in Unicorn config
Setup Procfile for Unicorn
Update rails to 3.2.12
Remove Capistrano gems
Remove Capistrano config
Update miscellaneous gems