Working on introducing operations and collectors. We need tests.
Testing formatValue
Testing fieldValuesToStr
Overriding...
Merge branch 'collectors' of github.com:ftomassetti/effectivejava into collectors

Conflicts:
	test/app/test/operations.clj
Tidying up operations
Implementing Operation and printTable
Improving printing to table
Fixing tests
Refactoring query "constructorsWithManyParameters" to use Operations
Migrate also item 3 to use operations