[cleanup] cleaning up tests
[task] finalized implementation #OSNG-191
[task] adding Extension to User #OSNG-191
[task] adding an extension adds the schema to the schema set
[enhancement] retrieval of single extension
[enhancement] retrieving all extensions returns an unmodifiable view
[cleanup] adding javadoc for new methods
[cleanup] cleaning up tests #OSNG-191
Merge pull request #3 from tkrille/OSNG-191

OSNG-191
[cleanup] renaming test urns
[cleanup] removing superfluous groovy dependency
[cleanup] typo
[fix] fixed #BT-13
Merge pull request #4 from tkrille/OSNG-191

[cleanup] renaming test urns
Merge pull request #5 from tkrille/BT-13

Fixed #BT-13
[test] adding test for setting field
Merge pull request #6 from tkrille/OSNG-191

[test] adding test for setting field
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