Motivation:

Meeting up with the new API design requires that the market-user
and organisation entity are realign.

Modification:

- factor out some part of market-user and create a new class (person)
- make organisation enity to extend audit-metadata and some properties
    were added.
- use the lombok project to reduce the boilerplate code in both
    the market-user and organisation entities.
- add 'person' to the list of PrefixEnum in the CerebrumEntityUuidGenerator

Result:

Market-user and Organisation entity are now re-worked

Target: master