Add record to track overridden limits

Before, we were relying on just changing the cards_count in account, but this
could create problems where the system to calculate the next card number fails due
to the unique constraint.

saas/lib/fizzy/saas/engine.rb

@@ -127,8 +127,8 @@ module Fizzy
       end
 
       config.to_prepare do
-        ::Account.include(Account::Billing)
-        ::Signup.prepend(Fizzy::Saas::Signup)
+        ::Account.include Account::Billing, Account::Limited
+        ::Signup.prepend Fizzy::Saas::Signup
         CardsController.include(Card::LimitedCreation)
         Cards::PublishesController.include(Card::LimitedPublishing)
 

saas/lib/tasks/fizzy/saas_tasks.rake

@@ -1,13 +1,6 @@
 require "rake/testtask"
 
 namespace :test do
-  # task :prepare_saas => :environment do
-  #   require "rails/test_help"
-  #
-  #   $LOAD_PATH.unshift Fizzy::Saas::Engine.root.join("test").to_s
-  #   require Fizzy::Saas::Engine.root.join("test/test_helper")
-  # end
-
   desc "Run tests for fizzy-saas gem"
   Rake::TestTask.new(saas: :environment) do |t|
     t.libs << "test"