sqlite3 => postgres
Specify Ruby 2 in the Gemfile
Relax Rails version to "~> 4.0"
Use thin
Move assets to :assets Bundler group
Add bcrypt-ruby
Add squeel
ERB => HAML
Add simple_form
Remove unused gems
Add BetterErrors and Pry for development
Setup cucumber environment
Remove Bundler.require

http://myronmars.to/n/dev-blog/2012/12/5-reasons-to-avoid-bundler-require
Upgrade Rails to 4.0.1.rc1
Clean up application.js and application.css
Add Twitter Bootstrap
Add InheritedResources
Add ActiveAttr
Don't display assets in development logs
Don't display asterisks for required fields