JIRA: https://jira.spring.io/browse/INT-4156
* Copy `Http` Java DSL from with some fixes to the `HttpMessageHandlerSpec` and Java 8 style
* Port `HttpDslTests` and "de-Boot" it with the Mock MVC
* Upgrade to Spring Security 4.2.0
* Make `spring-integration-security` as a dependency for HTTP module for better test coverage for Security from SI Web perspective
No need in `AuthenticationManager` bean
JavaDocs for HTTP DSL components and some JavaDocs improvements for `HttpRequestHandlingEndpointSupport` and `HttpRequestExecutingMessageHandler`
Restore optional ROME dependency for proper HTTP module compilation
Add missed JavaDoc and mark all HTTP tests with `@DirtiesContext`
Add JavaDocs for `Http` factory methods
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