JIRA: https://jira.spring.io/browse/INT-3527
* `WebSocketInboundChannelAdapter` now handles `CONNECT` STOMP message and sends `CONNECT_ACK` message to the `WebSocketSession` immediately
* `ExpressionMessageProducerSupport` implementations now checks the result of `expression` and if it is a `Message<?>` it is sent to channel without creating a new one
which previously wrapped that `Message<?>` as the `payload`.
* Add `<script>` support to the `<outbound-channel-adapter>`
* Upgrade to the SF 4.1.1
* Add appropriate notes to the Docs
JIRA: https://jira.spring.io/browse/INT-3511
Add note about Broker destinations
Doc Polishing
INT-3511: Fix 'useBroker' Docs and provide compatibility with SF 4.1.1
JIRA: https://jira.spring.io/browse/INT-3515
Change test suite to the Tomcat according IO
INT-3515: IllegalStateException for the `WebSocketInboundChannelAdapter`, when `useBroker = true`, but there is no Broker Relay in the Context
JIRA: https://jira.spring.io/browse/INT-1198
INT-1198: WebSocket: Add namespace support
Polishing components according to the namespace support experience
Parser for `<server-container>` and tests
INT-1198: Add parser tests for `<int-websocket:outbound-channel-adapter>`
Introduce `use-broker` on server side
Polishing according PR comments
`What's New` note
JIRA: https://jira.spring.io/browse/INT-1197
INT-1197: Add JavaDocs and some polishing
Further changes
* Upgrade to SF 4.1
* Rename `SubProtocolHandlerContainer` to the `SubProtocolHandlerRegistry`
* Add `MessageConverter` support to the adapters
* Add `ClientWebSocketContainer.openConnectionException` to be thrown on `getSession` request
* Add `ClientWebSocketContainer.connectionLatch` to wait the connection establishing on first request.
Since the WebSocket connection process is run in the separate Thread, we need to wait it from the first `message send` do not lose the message, if connection hasn't been established yet.
INT-1197: Add `PassThruSubProtocolHandler`
Add `StompIntegrationTests`
INT-1197: Polishing according PR comments
INT-1197: Use SockJs from tests
Fix other detected vulnerabilities
INT-1197: `@Gateway` with `@MessageMapping` test
INT-1197: PR comments
Skip non `SimpMessageType.MESSAGE` to send to the `outputChannel` from `WebSocketInboundChannelAdapter`
Polishing
