2013/4の時点でrails4を動かそうとしたGemfile

Gemfile

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.0.beta1'

gem 'i18n_generators'
gem 'simple_form'
gem 'devise', git: 'https://github.com/plataformatec/devise.git', branch: 'rails4'
gem 'protected_attributes'
gem 'kaminari'

group :development do
  gem 'letter_opener'
end

group :development, :test do
  gem 'sqlite3'
  gem 'rspec-rails', '2.13.0'
  gem 'factory_girl_rails', '4.2.1'
  gem 'database_cleaner', git: 'https://github.com/bmabey/database_cleaner.git'
  gem 'spork', '1.0.0rc3'
  gem 'growl'
  gem 'guard'
  gem 'guard-rspec'
  gem 'guard-spork'
  gem 'rb-fsevent', :require => false
end

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', '~> 4.0.0.beta1'
  gem 'coffee-rails', '~> 4.0.0.beta1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  gem 'therubyracer', platforms: :ruby
  gem 'less-rails'
  gem 'twitter-bootstrap-rails', git: 'http://github.com/seyhunak/twitter-bootstrap-rails.git'

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.0.1'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# Use unicorn as the app server
gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano', group: :development

# To use debugger
# gem 'debugger'

gem 'capistrano'
gem 'capistrano_colors'
gem 'capistrano-ext'
gem 'rvm-capistrano'
group :production do
  gem 'pg'
end

capistranoは動かなかった。