Issue: SPR-11129

Issue: SPR-11311

Issue: SPR-11266

Issue: SPR-8182
Issue: SPR-11243
Issue: SPR-11292
Issue: SPR-11318

Issue: SPR-11256

Issue: SPR-11301

Better integrated explanation of the 'default' profile with both XML
and Java config examples showing the same thing.

Issue: SPR-11256

- Remove formatting that interferes with code highlighting
- Fix some XML syntax issues
- Added missing punctuation

Issue: SPR-11280

Payload parameters in @MessageMapping annotated
methods can now also be validated when annotated
with a Validation annotation (@Valid, @Validated...).

A default Validator is registered by the MessageBroker
Configurer, but it is possible to provide a list of custom
validators as well.

Issue: SPR-11185

Issue: SPR-11232
Issue: SPR-11242

This commit documents meta-annotation support for test-related
annotations in the TestContext framework within the reference manual.

Issue: SPR-11109

Update the reference documentation with "What's new in Spring 4.0".

Update the MVC reference documentation with the new concepts and classes
introduced in Spring 4.0
This reverts commit 6f874d734a2a38431c74444894f54797ecf74933.

Update reference documentation with a new section for Spring 4's
WebSocket support.

Remove reference to removed deprecations and generally cleanup the MVC
documentation.
Cleanup Struts

Polish and cleanup the asciidoc source and prepare the reference guide
for the upcoming Spring 4.0 release.

Remove the entire What's new in Spring 3 section from the reference
documentation.

Extract the appendix into a separate asciidoc file in order to make the
main index.adoc easier to work with.

Issue: SPR-11149

Fix the reference documentation example for ConversionServiceFactoryBean
to use a `<set>` instead of a `<list>`.

Issue: SPR-10802

Issue: SPR-11057

Generate docbook xml from the asciidoc reference guide and use the
docbook-reference-plugin to generate HTML (single and multi-page) and
PDF documentation.

Issue: SPR-11096

Issue: SPR-11096

Remove the superfluous spaces that appear in the asciidoc source.

Issue: SPR-11096

Remove or replace broken links from the reference documentation.

Issue: SPR-11096

Remove the superfluous space that appears before each 'http' reference
in the asciidoc source. Presumably there due to some quirk of the
docbook conversion.

Issue: SPR-11096

Specify a specific asciidoc type of 'docbook' to prevent
'multiple titles at level 0' errors during generation.

Issue: SPR-11096