Add Windows growlnotify support

[denisdefreyne]

This fixes #253.

This is a work in progress. There are no tests yet, and I have no clear idea of how I would test this. Perhaps create a stub growlnotify executable and see whether it is called the right way.

[denisdefreyne]

It’s probably also a good idea to move the watcher into a separate object, maybe Nanoc::Extra::Watcher. The notification generation stuff should probably also be extracted, perhaps in Nanoc::Extra::UserNotifier. Easier to test!

Those changes belong in a separate pull request though. Stay tuned.

[denisdefreyne]

I’ll fix this later in a decent way. I’m refactoring the watcher quite significantly, and this pull request will be obsolete once I’m finished with that.

[denisdefreyne]

Since the watcher refactoring was cancelled (see #293), I think reopening this pull request makes sense.

I have no clue how to test this automatically. Maybe it isn’t automatically testable. Any ideas? @bobthecow?

@agross Can you test (manually) whether this pull requests works for you? If it does, it could be merged without presence of automated tests.

[agross]

@ddfreyne I'll test that either tomorrow or on Tuesday.

As for testing, why not check if nanoc builds the command line parameters correctly and calls #system accordingly?

[agross]

@ddfreyne I left a comment on denisdefreyne/nanoc@43a49c9cf3. If the typo is fixed, it will work. As always, thank you very much!

[denisdefreyne]

Awesome. I’ll add a test and release this in 3.6.3!

[denisdefreyne]

@bobthecow Review, merge and close #253 afterwards.