mstor - Alpha release (0.9.11)

This release of mstor sees a number a major changes including:

- refactoring of the connector architecture to support multiple mail repository store types (initially will support mbox and JCR repositories)

- improvements to mbox parsing to eliminate phantom messages

- improved unit testing framework for better test coverage

This is quite a significant release and I would encourage mstor users to upgrade for improved data integrity with mbox stores.