Fixed rails.rb to only run setup if env.rb calls it, otherwise throw …

…a warning

lib/cucumber/rails.rb

@@ -1,23 +1,29 @@
-require 'rails'
-require 'cucumber/rails/application'
-ENV["RAILS_ENV"] ||= "test"
-ENV["RAILS_ROOT"] ||= File.expand_path(File.dirname(caller.detect{|f| f =~ /\/env\.rb:/}) + '/../..')
-require File.expand_path(ENV["RAILS_ROOT"] + '/config/environment')
-require 'cucumber/rails/action_controller'
+env_caller = File.dirname(caller.detect{|f| f =~ /\/env\.rb:/}) if caller.detect{|f| f =~ /\/env\.rb:/}
+if env_caller
+  require 'rails'
+  require 'cucumber/rails/application'
+  ENV["RAILS_ENV"] ||= "test"
+  ENV["RAILS_ROOT"] ||= File.expand_path(env_caller + "/../..")
+  require File.expand_path(ENV["RAILS_ROOT"] + '/config/environment')
+  require 'cucumber/rails/action_controller'
 
-if defined?(ActiveRecord::Base)
-  require 'rails/test_help'
-else
-  require 'action_dispatch/testing/test_process'
-  require 'action_dispatch/testing/integration'
-end
+  if defined?(ActiveRecord::Base)
+    require 'rails/test_help'
+  else
+    require 'action_dispatch/testing/test_process'
+    require 'action_dispatch/testing/integration'
+  end
 
-if !Rails.application.config.cache_classes
-  warn "WARNING: You have set Rails' config.cache_classes to false (most likely in config/environments/cucumber.rb).  This setting is known to cause problems with database transactions. Set config.cache_classes to true if you want to use transactions.  For more information see https://rspec.lighthouseapp.com/projects/16211/tickets/165."
-end
+  if !Rails.application.config.cache_classes
+    warn "WARNING: You have set Rails' config.cache_classes to false (most likely in config/environments/cucumber.rb).  This setting is known to cause problems with database transactions. Set config.cache_classes to true if you want to use transactions.  For more information see https://rspec.lighthouseapp.com/projects/16211/tickets/165."
+  end
 
-require 'cucumber/rails/world'
-require 'cucumber/rails/hooks'
-require 'cucumber/rails/capybara'
+  require 'cucumber/rails/world'
+  require 'cucumber/rails/hooks'
+  require 'cucumber/rails/capybara'
 
-require 'cucumber/web/tableish'
+  require 'cucumber/web/tableish'
+else
+  warn "WARNING: Cucumber-rails required outside of env.rb.  The rest of loading is being defered until env.rb is called.
+  To avoid this warning, move 'gem cucumber-rails' under only group :test in your Gemfile"
+end