support OSX notifications as alternative to growl about rerun HOT 5 CLOSED

I want to code it in my fork and I will pull it back to rerun.

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I think that it's ready. For testing you can download my fork and run the rake install command for having my version of rerun locally.

For me it's working like a charm.

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Hey @RaVbaker - you may already know about this feature, but if you put something like:

This closes issue #33

... somewhere in the description of your pull request #40 then github will automatically close this issue if/when the pull request gets merged into master.

edit: sorry, I just noticed that you already included it in the commit message, which effectively achieves the same thing... ignore me 😄

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starting work on this here: 5532e9b

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and finished here (mostly): 95a1eb1

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