Events now use the id as source. The id is encapsulated in a value object to support null ids in BeforeInsert events. Entity references in events are now Optionals. Dropped redundant Event suffix from events. Added "@since 2.0" to classes. Replaced constructors and getters with Lombok annotations. Simplified pom.xml. Extracted interface JdbcPersistentEntity and JdbcPersistentProperty. Integration tests use the Spring Test framework. Fixed test for entities with primitive id type.
Original pull request: #5.
Jens Schauder