New Rails 4 application setup

.railsrc

# ~/.bashrc
--skip-bundle
--skip-test
--database postgresql

Gemfile

source 'https://rubygems.org'

gem 'rails', '4.0.4'
gem 'pg'
gem 'sass-rails', '~> 4.0.2'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.2'
gem 'puma'
gem 'foreman'

Procfile

web: bundle exec puma -C config/puma.rb

puma.rb

# config/puma.rb
# see more at https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server
workers Integer(ENV['PUMA_WORKERS'] || 3)
threads Integer(ENV['MIN_THREADS']  || 1), Integer(ENV['MAX_THREADS'] || 16)

preload_app!

rackup      DefaultRackup
port        ENV['PORT']     || 3000
environment ENV['RACK_ENV'] || 'development'

on_worker_boot do
  # worker specific setup
  ActiveSupport.on_load(:active_record) do
    ActiveRecord::Base.establish_connection
  end
end