Don't try to load the FSEvents listener on older versions of OSX. #238
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OS X 10.4.x (and earlier) don't have a (public) FSEvents API, and the FSEvent listener will not work for those OS versions. This means that you need to always remember to use --no-vendor when you invoke guard, or it will fail. This is a small change to the way the OS is detected to make it only try the FSEvents listener on appropriate versions of darwin.