title: Cucumber/Capybara: tests fail randomly under PhantomJS
body: <p>When I run cucumber scenarios under PhantomJS I get</p>
  
  <pre><code>Capybara::ElementNotFound: Unable to find css ".given_class"
  </code></pre>
  
  <p>exceptions in random places</p>
  
  <p>it looks like driver does not wait for element appearance</p>
  
  <p>I'm using:
  Ruby 2.0 
  Cucumber 1.3.6 
  Capybara 2.1.0 
  Selenium-webdriver 2.35.1 
  PhantomJS 1.9.1</p>