generate Subscribers resource
delete test dir
add rspec-rails, install rspec
add 'new' action on subscribers controller
add home controller, home#index route and action
delete home controller, use subscribers#home instead
git rm home controller related generated files
subscribers, home page subscription form
subscriber#confirm written
 add @subscriber.active = true
migration -> last_email to subscribers
refactor subscribers#confirm to subscribers#confirm_or_unsubscribe
modify validates_presence_of :token to validates
replace swear word with 'this should not happen
replace redirect_to with render in subscribers#new