mechanize：Mechanize#cookies

>> require 'mechanize'
=> true
>> agent = Mechanize.new
=> #<Mechanize:0xb74b5840
  ...
>> agent.cookies
=> []
>> agent.get('http://google.com/')
=> #<Mechanize::Page
 {url #<URI::HTTP:0xb74a4d60 URL:http://www.google.co.jp/>}
  ...
>> agent.cookies
=> [#<Mechanize::Cookie:0xb74ab214
  ...