# File lib/heroku/api/processes.rb, line 78
    def put_formation(app, options)
      options.each { |process, size| options[process] = {'size' => size} }
      request(
        :body     => MultiJson.dump(options),
        :expects  => 200,
        :method   => :put,
        :path     => "/apps/#{app}/formation"
      )
    end