SF Patch #1455676:  Simplify using Queues with daemon consumer threads

Adds join() and task_done() methods to track when all enqueued tasks have
been gotten and fully processed by daemon consumer threads.
diff --git a/Misc/NEWS b/Misc/NEWS
index ba078b2..1d75424 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -483,6 +483,10 @@
 Library
 -------
 
+- Queue.Queue objects now support .task_done() and .join() methods
+  to make it easier to monitor when daemon threads have completed
+  processing all enqueued tasks.  Patch #1455676.
+
 - popen2.Popen objects now preserve the command in a .cmd attribute.
 
 - Added the ctypes ffi package.