rake db:seed should check if the database have pending migrations [#5163 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/lib/active_record/railties/databases.rake

@@ -274,7 +274,7 @@ namespace :db do
   task :setup => [ 'db:create', 'db:schema:load', 'db:seed' ]
 
   desc 'Load the seed data from db/seeds.rb'
-  task :seed => :environment do
+  task :seed => 'db:abort_if_pending_migrations' do
     seed_file = File.join(Rails.root, 'db', 'seeds.rb')
     load(seed_file) if File.exist?(seed_file)
   end