refs #181 update blogs on the admin page
refs #221 'rails generate migration AddAdminToUser admin:boolean'
refs #221 'rake db:migrate' and 'rake db:migrate RAILS_ENV=test'
refs #251 'rails generate task set_data'
refs #261 'rails generate mailer notifier create_blog'
refs #261 send mail by 'Notifier.create_blog.deliver'