Getting cookies from Capybara's Poltergeist driver

List cookies: ```ruby page.driver.browser.cookies ``` Remove cookie: ```ruby page.driver.browser.remove_cookie 'hello' ``` Also see [show\_me\_the\_cookies](https://github.com/nruth/show_me_the_cookies/blob/master/lib/show_me_the_cookies/adapters/poltergeist.rb)