adds controllers, models and association between states and cities
adds gems 'rspec-rails', 'pry' and 'pry-nav' in development and test env
adds the routes
adds actions to controllers
adds seed data
adds all the finished states views
replaces url with rails path helper in states controller
adds all the finished city views, updates cities_controller
updates states index page to show all the associated cities
adds route to root
adds RSpec for testing controllers
adds button 'Delete city' to state index view, required layout change from <table> to <section>/<div>