Added a sample.

samples/growl_sample.rb

@@ -0,0 +1,36 @@
+require 'osx/cocoa'
+require File.expand_path('../../lib/growl', __FILE__)
+
+class GrowlController < OSX::NSObject
+  HELLO_TYPE = 'Hello message received'
+
+  def init
+    if super_init
+      @g = Growl::Notifier.sharedInstance
+      @g.delegate = self
+      @g.register('GrowlSample', [HELLO_TYPE])
+      @g.notify(HELLO_TYPE, 'Sticky', 'Hello world', :sticky => true, :click_context => Time.now.to_s )
+      @g.notify(HELLO_TYPE, 'Timed out', 'Hello world', :click_context => Time.now.to_s )
+      @count = 2
+      self
+    end
+  end
+
+  def growlNotifier_notificationClicked(sender, context)
+    puts "Clicked: #{context}"
+    checkCount
+  end
+
+  def growlNotifier_notificationTimedOut(sender, context)
+    puts "Timed out: #{context}"
+    checkCount
+  end
+
+  def checkCount
+    @count -= 1
+    OSX::NSApp.terminate(nil) if @count == 0
+  end
+end
+
+g = GrowlController.alloc.init
+OSX::NSApp.run