Change log:
9ce3dde Upgrade versions; prepare for release
30885f5 Issue 1450: avoid NullPointerException which occurs during shutdown o… (#1451)
3cb1a74 GH-1436: Async Stop Containers
d4374a6 GH-1441: Fix Payload Detection with MessageHeaders
6930d1c GH-1439: Fix Memory Leak with Misconfiguration
