Refactor delete operation to DeleteBuilder with "delete by id" and "delete by parent" options. #26

* delete builder refactoring
Refactor delete operation to DeleteBuilder with "delete by id" and "delete by parent" options. #26

* unrelate should stop deleting target object
Refactor delete operation to DeleteBuilder with "delete by id" and "delete by parent" options. #26

* supporting parent in deletes
* refactoring parent qualifier building code into EntityParent
Refactor delete operation to DeleteBuilder with "delete by id" and "delete by parent" options. #26

RELEASE NOTES