Update rails to version 4.2

Furthermore it was necessary to add the following gems:
- responders
- web-console

And additional it was necessary to update these gems manually:
- devise
- turbolinks
- delayed_job_active_record
- money-rails

And the corresponding dependencies.
http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-4-1-to-rails-4-2

spec/features/tickets_spec.rb

@@ -52,7 +52,8 @@ feature Ticket do
         click_button 'Update Ticket'
 
         ticket.reload
-        expect(ticket.price).to eq(50)
+        # It's necessary to multiply by 100 because the price is in cents
+        expect(ticket.price).to eq(Money.new(50 * 100, 'USD'))
         expect(ticket.title).to eq('Free Ticket')
         expect(flash).to eq('Ticket successfully updated.')
         expect(Ticket.count).to eq(1)
@@ -68,7 +69,8 @@ feature Ticket do
         click_button 'Update Ticket'
 
         ticket.reload
-        expect(ticket.price).to eq(100)
+        # It's necessary to multiply by 100 because the price is in cents
+        expect(ticket.price).to eq(Money.new(100 * 100, 'USD'))
         expect(ticket.title).to eq('Business Ticket')
         expect(flash).to eq("Ticket update failed: Title can't be blank. Price cents must be greater than 0.")
         expect(Ticket.count).to eq(1)