Adding letter opener for development and Rack::Attack for future rate limiting implementations

config/application.rb

@@ -33,5 +33,7 @@ module Mastodon
       Doorkeeper::AuthorizedApplicationsController.layout 'dashboard'
       Doorkeeper::AuthorizationsController.layout         'auth'
     end
+
+    config.middleware.use Rack::Attack
   end
 end

config/environments/development.rb

@@ -38,4 +38,6 @@ Rails.application.configure do
 
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
+
+  config.action_mailer.delivery_method = :letter_opener
 end

config/initializers/rack-attack.rb

@@ -0,0 +1,3 @@
+class Rack::Attack
+  # TODO
+end