add imperative event for the setting of a node value
update sbt project to use subprojects, this intends to fix eclipse project generation
Merge pull request #14 from sprankhub/imperative-event

Add Imperative Event For The Setting Of A Node Value
implemented nodeEvaluationEndedWithException event
avoid null.instanceof
Merge pull request #16 from sprankhub/log-evaluation-ended-with-exception

Implemented nodeEvaluationEndedWithException Event