Fixed small typo in documentation about extra lazy associations #DWEB-118
Merge pull request #1148 from naitsirch/hotfix/DWEB-118

[DWEB-118] Fixed small typo in documentation about extra lazy associations
- Fixed the basic entity persister so that versioned OneToOne entities can be created
- Created an IdentifierFlattener utility class
- Moved the logic for the flatten identifier method into the new utility class
- Replaced calls for private flattenIdentifier to use new utility
- Added appropriate unit tests