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
afe56ca6d5