NH-3072: OneToManyPersister improvements
Fix NH-3221
NH-3221 - Correct test case to reference HashSet instead of HashedSet
NH-2756 - Add test fixture
Add support for Convert.ToInt32 / int.Parse

Also support for decimal and double.

NH-2865 : Test case added
NH-3377 : Test case added
NH-2692 - The identity for values or components is the elements themselves,
so return "elements" as property name
NH-2692 - Add KnownBug attribute
NH-3524 - Add support for DateTimeOffset properties in QueryOver
NH-3041 - Add IOneToOneMapper.PropertyReference method