Refactored caesar_cipher.rb to include passing methods to map in form '.map(&:method)'
Refactored 'concatenate.rb' and removed test case.
Restarted 'hanoi.rb' with HanoiGame as class, taking any number of disks.
Refactored 'hanoi.rb'. Added ability to draw towers
Refactored 'hanoi.rb'. Created ability to move disks with checks (#move_disk).