JIRA: https://jira.spring.io/browse/INT-275
In addition fix the `Lifecycle` issue in the `ServiceActivatorAnnotationPostProcessor`
Add Namespace support, Addition tests
and fix some typos in the XSD
INT-275: Fix failed tests
INT-275: Fix for `replyChannel` Header
Add `sync` reply test-case
INT-275: Make `ScatterGatherHandler` sync
Fix some `MessageHandler`s from `SmartLifecycle`
INT-275: Fix `ScatterGatherHandler.handleRequestMessage` logic
INT-275: Fix `ScatterGatherHandler` JMX proxying issues
* Make `AbstractCorrelatingMessageHandler.getMessageStore()` as `public`
* Move `ScatterGatherHandlerIntegrationTests` to the JMX module to be sure that `ScatterGatherHandler`
works well with `@EnableIntegrationMBeanExport`
* Add xml config sample how to use an internal gatherer's `MessageStore` in the `MessageGroupStoreReaper`
* Add `What's New` notice
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