[test] split up User and Extension tests
[enhancement] added hashCode() and equals()
[fix] added JPA annotation for Enum field
[test] added test for updating extension value
[cleanup] renamed field
[enhancement] added methods for registering extension and adding
extension field value
[fix] fixed JPA annotations
[cleanup] removed unused jackson annotations
[fix] updated ddl to reflect fixed entity model
[fix] removed wrong annotations properties for registered extensions
Merge pull request #31 from tkrille/OSNG-185

Osng 185 Good Work