Modify tests for new GuessChecker

* Remove redundant code
Refactor game class

* Move logic to guess_checker class

* Add tests on public methods

* Add turn count to win message
Clean up message printer class

* Clarify results output for user guess

* Add turns count to win message
Fix broken board spec

* Unused at this point, for future development
Fix guess_checker #color_only output

* Need to delete_at index, not the value of index

* Add complete tests on variety of guess combos