Merge pull request #26 from tkrille/OSNG-209

Osng 209
Merge pull request #27 from tkrille/OSNG-209

[test] fixed failing test
Moved FieldType out of extra package and renamed it
Merge pull request #28 from wallner/fieldTypeRename

Moved FieldType out of extra package and renamed it
[test] added helper class for Date handling
[enhancement] added serializer for typed extensions
[cleanup] updated to new package structure