Rearrange code to mimic number mind
Refactor for:

* valid_input

* process_game_turn

* fix turn counter

* fix #exit bug by checking for up cased input
Remove redundant #play_game 

* Code refactored into other methods
Send all messages to printer

* Remove instance variables where able
Move mastermind to bin
Make mastermind.rb executuable
Remove scratch-pad code testing file
Rachel Refactor
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
Merge pull request #1 from bayendor/refactor

Refactor into new classes