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System notifications using the
[growl]( gem.

This gem is available for OS X and sends system notifications to
[Growl]( through the
[GrowlNotify]( executable.

The `growlnotify` executable must be installed manually or by using

Sending notifications with this notifier will not show the different
Guard notifications in the Growl preferences. Use the :gntp notifier
if you want to customize each notification type in Growl.

@example Install `growlnotify` with Homebrew
  brew install growlnotify

@example Add the `growl` gem to your `Gemfile`
  group :development
    gem 'growl'

@example Add the `:growl` notifier to your `Guardfile`
  notification :growl

@example Add the `:growl_notify` notifier with configuration options to
your `Guardfile` notification :growl, sticky: true, host: '',
password: 'secret'
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