Implemented String[][] for items and singers search. Not done yet
Added return String[][] to precise item search
Added checks for singer quantity and fixed a bug with singer names
Refactored the code: removed most of the printfs
Refactored tests: moved helper tests to a different class
Merge pull request #27 from ellina-s/ellina

Ellina
Merge pull request #28 from ellina-s/clark

More GUI changes