[#1566] Update to hibernate 4.2.15
[#1566] Partial Fix TransientObjectException when orphanRemoval = true and removing and adding items
[#1503] Partial fix Nested OneToMany relationships with orphanRemoval fails to commit
[#1847] Partial fix Orphan removal not cascaded for @OneToOne relationships
Merge pull request #782 from xael-fry/lighthouse-1566-patch

[#1566] Update to hibernate 4.2.15