1. https://speakerdeck.com/timmoore/embracing-capybara?slide=18 2. https://robots.thoughtbot.com/write-reliable-asynchronous-integration-tests-with-capybara 3. https://gist.github.com/zhengjia/428105 4. https://robots.thoughtbot.com/automatically-wait-for-ajax-with-capybara
