XD-900 Phase I

PropertyAccessors are now inheritable.

PropertyAccessors provided to the IntegrationEvaluationContextFactoryBean
are now named, to enable normal bean inheritance/override semantics.

This commit changes spel-context.xml to configure a Map instead of a List
of accessors.

Phase II will elevate the factory bean to the parent (module common)
context.
XD-899 container startup without admin

- Use lazyConnectionDataSourceProxy as dataSource for batch
- Added custom JobRepositoryFactoryBean to use this dataSource
Applied copy logic to the mail source module

Note that the mail modules does NOT work in this setup. Purpose of this
commit is to review build logic.
Apply new build to all mail related modules
Slightly better eclipse experience