Can't get cucumber tests running in headless on OSX - works on ubuntu?
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In my `env.rb` file, I have this:

    if ENV["HEADLESS"] == 'true'
        require "headless"
        @headless = Headless.new
        @headless.start
    end

This works fine in Ubuntu, but not in OSX. The browser still pops up. What do I need to do to make this work in OSX?