upgrade(rails 5): no longer use rake to invoke rake tasks, use rails

though I left the case alone where the command would previously been
just `bundle exec rake`, as doing the same doesn't work for rails.

config/application.rb

@@ -23,7 +23,7 @@ module Railsgoat
     # config.active_record.observers = :cacher, :garbage_collector, :forum_observer
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
-    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
+    # Run "rails -D time" for a list of tasks for finding time zone names. Default is UTC.
     # config.time_zone = 'Central Time (US & Canada)'
 
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.

config/database.yml

@@ -19,7 +19,7 @@ mysql:
   password:
 
 # Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
+# re-generated from your development database when you run "rails".
 # Do not set this db to the same as development or production.
 test:
   adapter: sqlite3

config/environments/production.rb

@@ -15,7 +15,7 @@ Railsgoat::Application.configure do
   # config.action_dispatch.rack_cache = true
 
   # Disable Rails's static asset server (Apache or nginx will already do this).
-  config.serve_static_files = false
+  config.public_file_server.enabled = false
 
   # Compress JavaScripts and CSS
   config.assets.compress = true

config/environments/test.rb

@@ -8,8 +8,8 @@ Railsgoat::Application.configure do
   config.cache_classes = true
 
   # Configure static asset server for tests with Cache-Control for performance.
-  config.serve_static_files = true
-  config.static_cache_control = "public, max-age=3600"
+  config.public_file_server.enabled = true
+  config.public_file_server.headers = { 'Cache-Control' => 'public, max-age=3600' }
 
   # Show full error reports and disable caching.
   config.consider_all_requests_local       = true