Create a useful benchmark for measuring Hibernate performance

[dzou]

Currently the Hibernate benchmarking code is quite experimental. It would be useful to create a more comprehensive benchmark that users can refer to and understand.

Notes:

• More entity types (use interleaved tables)
• Use batching (overall settings should be optimized)
• Include Scaling Options
• Configurable load settings
• Should take into consideration warm up time
• Add documentation for users; generate useful reports