bundle && bundle exec rspec spec
BUNDLE_GEMFILE=Gemfile.rails-3.2.12 bundle && BUNDLE_GEMFILE=Gemfile.rails-3.2.12 bundle exec rspec spec
BUNDLE_GEMFILE=Gemfile.rails-3.1.11 bundle && BUNDLE_GEMFILE=Gemfile.rails-3.1.11 bundle exec rspec spec
BUNDLE_GEMFILE=Gemfile.rails-3.0.20 bundle && BUNDLE_GEMFILE=Gemfile.rails-3.0.20 bundle exec rspec spec
BUNDLE_GEMFILE=Gemfile.rails-2.3.17 bundle && BUNDLE_GEMFILE=Gemfile.rails-2.3.17 bundle exec rspec spec
BUNDLE_GEMFILE=Gemfile.rails-4-beta bundle && BUNDLE_GEMFILE=Gemfile.rails-4-beta bundle exec rspec spec
