Migration command

    %w(packages keep_releases strategy scm_provider rollback_on_error environment purge_before_symlink 
    create_dirs_before_symlink symlinks symlink_before_migrate migrate migration_command restart_command 
    environment_name enable_submodules).each do |method_name|
      self.send(method_name, method_name) if %w(method_name).include?(site_opts)
    end