Enable multipleStoresDetected overriden

The RepositoryConfigurationDelegate class do not enable to chose the ClassPathScanningCandidateComponentProvider used by the multipleStoresDetected.
In order to extend Spring Data Commons to support VFS2, I need to inherites from ClassPathScanningCandidateComponentProvider and choose a custom implementation of the ResourcePatternResolver interface.
Olivier, I need this change for the OSS project https://github.com/arey/spring4-vfs2-support
Without this change, I'll be block to the Spring Data JPA 1.6.4

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