appraise 'rails3.2' do
  gem 'rails', '~> 3.2.21'
end

appraise 'rails4.0' do
  gem 'rails', '~> 4.0.12'
end

appraise 'rails4.1' do
  gem 'rails', '~> 4.1.8'
end

appraise 'rails4.2' do
  gem 'rails', '~> 4.2.0'
end