Added NotificationQueue::remove function

This includes appropriate tests, which pass on my Mac 10.4 machine

Foundation/testsuite/src/NotificationQueueTest.h

@@ -34,6 +34,7 @@ public:
 	void testWaitDequeue();
 	void testThreads();
 	void testDefaultQueue();
+	void testQueueRemove();
 
 	void setUp();
 	void tearDown();