Cucumber: Detect if the current Capybara driver supports Javascript

Copy the attached file to features/support. This gets you a convenience method:

CopyCapybara.javascript_test?

Is true for Selenium, capybara-webkit, Poltergeist and a custom driver called :chrome (which we sometimes like to use for Selenium+Chrome).

Similar sounding but completely different card: Detect if a Javascript is running under Selenium WebDriver (with Rails)