Headless support in watirmark

headless.rb

def new_watir_browser
  set_headless if config.headless
  .....
end

def set_headless
  begin
    require 'headless'
    @headless = Headless.new
    @headless.start
  rescue LoadError, Headless::Exception => e
    unless RbConfig::CONFIG['host_os'].match('linux')
      warn "Attempted to run in headless mode, but xvfb support is limited to linux"
    else
      warn "Attempted to run in headless mode, but #{e.message}"
    end
  end
end