Unified benchmarks into one for JDBC and JPA. They're now both testing the data access with the plain infrastructure (JdbcTemplate and EntityManager) plus interactions via Spring Data repositories on top of that. Added build profiles to run the same benchmarks against an in-memory H2, a locally running H2 and a locally running Postgres. See the readme for setup instructions.
The JdbcFixture contains code to optionally disable event publication for the JDBC operation. Uncomment the line invoking disableEntityCallbacks(…).
Changed the benchmarks to use 10 warmup iterations instead of 5 to make sure we're at stable numbers once the measurement happens.
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