[task] added sortBy field handling to filter fields
[cleanup] restructuring package layout for queries, renaming classes
[fix] fixing tests to reflect new package layout for queries
[enhancement] improved default sortBy field logic
[fix] added check for wrong filter field
[fix] use fromString() instead of valueOf()
[fix] added check for wrong sortBy field
[fix] removed default value for sortBy
[cleanup] formatting + imports
[fix] fixed test to reflect removal of default value for sortBy
Merge pull request #76 from tkrille/OSNG-261

Osng 261