add test gems
change test-unit to rspec
rails g rspec:install
use rspec, factory_girl
use mysql2
rails g rspec:controller users
rails g scaffold article user:references body:text
add association user to articles
rake my_engine:install:migrations
bundle exec rails plugin new my_engine/admin --mountable -T
require admin/lib
deploy at my_engine/admin
scaffold admin/articles
mount MyEngine::Admin