upgrade to rails3, but grip is broken

Rakefile

@@ -1,10 +1,10 @@
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
-require(File.join(File.dirname(__FILE__), 'config', 'boot'))
+require File.expand_path('../config/application', __FILE__)
 
 require 'rake'
 require 'rake/testtask'
 require 'rake/rdoctask'
 
-require 'tasks/rails'
+Rails::Application.load_tasks