Replace PrototypeR4 by Orbit.

Move session into mongoid_store.
Reset session when sing_in.

vendor/built_in_modules/new_blog/config/initializers/app_config.rb

@@ -3,7 +3,7 @@
 #       # Add a load path for this specific Engine
 #       # config.autoload_paths << File.expand_path("../lib/some/path", __FILE__)
 #       put "ABC"
-#       PrototypeR4::Application::Orbit_Apps << "NewBlog"
+#       Orbit::Application::Orbit_Apps << "NewBlog"
 #       
 #       # initializer "my_engine.add_middleware" do |app|
 #       #   app.middleware.use MyEngine::Middleware
@@ -15,4 +15,4 @@ module NewBlog
   VERSION = "0.0.1"
   MOUDLEAPP_TITLE =  "NewBlog"
 end
-# PrototypeR4::Application::Orbit_Apps << "NewBlog"
+# Orbit::Application::Orbit_Apps << "NewBlog"