Add handlers that comment out AR specific configuration

Author: dkubb

templates/rails/config.rb

@@ -1,3 +1,4 @@
+# Add railtie configuration for dm-rails and rails components
 gsub_file 'config/application.rb', /require 'rails\/all'/ do
 <<-RUBY
 # Comment out the frameworks you don't want (if you don't want ActionMailer,
@@ -11,3 +12,13 @@
 require 'rails/test_unit/railtie'
 RUBY
 end
+
+# comment out active_record specific configuration
+%w[
+  config/application.rb
+  config/environments/development.rb
+  config/environments/production.rb
+  config/environments/test.rb
+].each do |path|
+  gsub_file path, /^(\s*)(config\.active_record)\./, '\1# \2'
+end