Refactored ChoicePoint tests
Added Post Transition Hook
Added tests to prove two bugs while handling ChoicePoints:
 1. Current state can be set to null if choice final state is null
 2. Simple transitions can be overwritten with ChoicePoints
Added fromStatus and toStatus to postTransition
Merged
Exception raised when choice overwrites a transition
New version 0.64 on pom
Merge branch 'develop'