Add magic encoding comment to generated files

If db/schema.rb doesn't exist then the error message suggests editing config/boot.rb, whereas I believe it should be config/application.rb

diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index 8e53322..cbfe20c 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -357,7 +357,7 @@ namespace :db do
       if File.exists?(file)
         load(file)
       else
-        abort %{#{file} doesn't exist yet. Run "rake db:migrate" to create it then try again. If you do not intend to use a database, you should instead alter #{Rails.root}/config/boot.rb to limit the frameworks that will be loaded}
+        abort %{#{file} doesn't exist yet. Run "rake db:migrate" to create it then try again. If you do not intend to use a database, you should instead alter #{Rails.root}/config/application.rb to limit the frameworks that will be loaded}
       end
     end
   end

Aside: It's also not at all obvious what change you should make in this file. You really have to generate a fresh skeleton with --skip-active-record to see what's required.

BEFORE:

require 'rails/all'

AFTER:

# Pick the frameworks you want:
# require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "rails/test_unit/railtie"