Improved Builders (for configuration)
and added Builder for TTL
Fixed tests with new DataWrapper
Improved TTL: all model classes inherit from DataWrapper --> TTL

TTLStore is now Singleton because it is ok to be static.
Add tests for process step and fix some minor issues
Merge branch 'versioning'

Conflicts:
	org.hive2hive.core.test/src/org/hive2hive/core/test/H2HTestSuite.java
	org.hive2hive.core/src/org/hive2hive/core/network/messages/BaseMessage.java
	org.hive2hive.core/src/org/hive2hive/core/network/messages/MessageManager.java