Merge branch 'feature-jpa-implementation' of https://github.com/axlm/Entity into feature-jpa-implementation

* 'feature-jpa-implementation' of https://github.com/axlm/Entity:
  Updated POM. Added custom maven actions.
  Added serialVersionUID. Sigh...
  Modified POM to include license injection maven plugin. Added BSD2 license.
  Updated project version.
  Fixed compareTo logic bug.
Refactored code as a result of an API change in Modifier.