Improve fast specs helper to autoload the library

spec/fast_spec_helper.rb

@@ -3,14 +3,8 @@ require 'bundler/setup'
 ENV['GITLAB_ENV'] = 'test'
 ENV['IN_MEMORY_APPLICATION_SETTINGS'] = 'true'
 
-unless Object.respond_to?(:require_dependency)
-  class Object
-    alias_method :require_dependency, :require
-  end
-end
-
-# Defines Settings and Gitlab.config which are at the center of the app
 require_relative '../config/settings'
-require_relative '../lib/gitlab' unless defined?(Gitlab.config)
-
 require_relative 'support/rspec'
+require 'active_support/all'
+
+ActiveSupport::Dependencies.autoload_paths << 'lib'