SpringSource/spring-integration — pull request #864 by artembilan (2013-09-02 11:14:00+00:00)
Title: INT-3070: fix Delayer with MongoDbMessageStore

The `DelayHandler.DelayedMessageWrapper` works correctly, as designed by INT-3049.
However `DelayHandler.DelayedMessageWrapper` contains `Message` as a property
and `GenericMessage` can't be reconstructed automatically.

So, added new `DBObjectToGenericMessageConverter` to read `GenericMessage` for
`DelayHandler.DelayedMessageWrapper#original` property.

JIRA: https://jira.springsource.org/browse/INT-3070

Cherry-picked 2.2.x