Modify Rakefile to load engine tasks and testing railtie tasks

Rakefile

@@ -4,31 +4,12 @@ begin
 rescue LoadError
   puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
 end
-begin
-  require 'rdoc/task'
-rescue LoadError
-  require 'rdoc/rdoc'
-  require 'rake/rdoctask'
-  RDoc::Task = Rake::RDocTask
-end
-
-RDoc::Task.new(:rdoc) do |rdoc|
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title    = 'RefinerycmsBlog'
-  rdoc.options << '--line-numbers'
-  rdoc.rdoc_files.include('README.rdoc')
-  rdoc.rdoc_files.include('lib/**/*.rb')
-end
-
-require 'rspec/core/rake_task'
-
-desc "Run specs"
-RSpec::Core::RakeTask.new(:spec => 'refinery:testing:engine:init_test_database')
 
 APP_RAKEFILE = File.expand_path("../spec/dummy/Rakefile", __FILE__)
-load 'rails/tasks/engine.rake'
-load 'refinery/tasks/testing.rake'
 
-Bundler::GemHelper.install_tasks
+if File.exists?(APP_RAKEFILE)
+  load 'rails/tasks/engine.rake'
+end
 
-task :default => 'refinery:testing:engine:setup'
+require "refinerycms-testing"
+Refinery::Testing::Railtie.load_tasks