Java 8 Update of Bitemporal Framework

Just to push this out to the world a bit more: I've updated the "com.ervacon.bitemporal" framework to bring it up-to-date with current-day Java:

• Use Java 8's new time classes instead of JodaTime
• Leverage Java 8's goodies where relevant: streams, diamond operator, ...
• Switched to Hibernate 5
• Use JUnit 4

Just as before, "com.ervacon.bitemporal" provides a good starting point for those that need to tackle temporal issues in their applications. For more information, check the GitHub page: https://github.com/klr8/bitemporal.