merged from upstream, add jpa persist listener
merged, added jpa persist listener
Merge branch 'master' of https://github.com/arweed/kcalculator

Conflicts:
	kcalculator/kcalculator-domain/.classpath
	kcalculator/kcalculator-ejb/src/test/java/com/kcalculator/testbaseContainerTestBase.java
clear stack after deleting entities