Summary
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Switched backend to JPA over hibernate over MySQL.

Details
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Neo4j has been ditched in favour of relational db backend.

Neo4j version has been parked on a branch.

This commit is represents a skeletal JPA/Hibernate/MySQL
backend implementation, and contains a single domain class
(guru) and a JPA repository to act on them.

A simple smoke test application exists to check it all hangs
together

Ticket
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N/A