initial commit of new User Deserializer
Merge pull request #7 from tkrille/OSNG-190

OSNG-190
fixed Constants.CORE_SCHEMA change problems in the server
and in SCIMSearchResults. was Set before and is String now
[cleanup] Renamed all Spock tests to specs
Implemented deserializing of schema extensions
[enhancement] switching from file-based to template-based test data
[task] implementing serialization for User and Extension
[test] improving deserialization test
[fix] initializing collection/map fields to empty instances instead of
null
[test] adding utility class for json fixtures
[test] switching to json fixture utility class
[test] improved serialization tests
[cleanup] cleaned up imports and formatting
[cleanup] Javadoc updates