Add webmock for external requests in tests

external_request.rb needs to be required before lint is run.

lib/tasks/factory_girl.rake

@@ -1,9 +1,12 @@
+require_relative '../../spec/support/external_request'
+
 namespace :factory_girl do
   desc "Verify that all FactoryGirl factories are valid"
   task lint: :environment do
     if Rails.env.test?
       begin
         DatabaseCleaner.start
+        mock_commercial_request
         FactoryGirl.lint
       ensure
         DatabaseCleaner.clean