I am using Capybara-Webkit to automate some work on a website. This is done in the background in a Resque task. After some executions there are quiet a lot webkit_server processes, that weren't closed by Capybara. So how can I force Capybara to close it at the end?
session = Capybara::Session.new(:webkit)
session.visit URL
session.click_button(BUTTON)
....