Fix while Block Formatting in SimplePool
INT-2994 Advice Chain Config via Annotations

Allow configuration of request handler advice chain using

- ServiceActivator
- Filter
- Splitter
- Transformer

annotations.

Also, with splitter, allow setting discardWithinAdvice (See
INT-2938).

INT-2994 Polishing: PR Comments

- Change adviceChain attribute to an array
- Use a boolean for the discardWithinAdvice attribute

INT-2994 Handler Advice Doc Polishing

Add a paragraph about Advice Order.
INT-3051 Derive Script Language from Extension

Make 'lang' attribute optional on a script element and
attempt to derive the language from the file extension.

Change return value on ScriptParser.deriveLanguageFromExtension to the language name

Polishing (PR Comments)
INT-2243: Delayer: Add 'expression' Support

Previously, the `<delayer>` provided a `delay-header-name` attribute.
In complex cases there was need to precede it with `<header-enricher>`.

* Add support for an 'expression' attribute and sub-element
* Deprecate `delay-header-name`
* Make `DelayHandler.DelayedMessageWrapper` *public* to allow access for Messages in the Store
* Add tests
* Add 'What's new' section
* Polishing Delayer's doc regarding new abilities

JIRA: https://jira.springsource.org/browse/INT-2243, https://jira.springsource.org/browse/INT-3049

INT-2243: ban delay-header-name with expression

INT-2243 Polishing

INT-2243: fall-back to default on Eval Exception

INT-2243: DelayedMessageWrapper refactoring

* Make `DelayedMessageWrapper` Spring Data Mongo mapping compatible.
In terms of Spring Data - add Persistence Constructor

INT-2243 add 'ignore-expression-failures' support

* Add `ignore-expression-failures` to the `<delayer>`
* Add tests for `ignore-expression-failures`
* Add a note to the RM
* Describe SpEL side-effects for `DelayHandler`

Doc Polishing
Do not attempt to evaluate uri variables that are not in the URL

The http gateway might not know what uri variables it might obtain in the URI.
This patch makes sure that only the uri variables defined in the uri are parsed (the rest are ignored)
Permit missing URI vars in HTTP outbound gateway

The http gateway might not know what uri variables it might obtain in the URI.
This patch makes sure that only the uri variables defined in the uri are parsed (the rest are ignored)
INT-3054: add ExpressionEvalMap support