Initial command line game commit
Add playground to try out method calls and flesh out Message class

The playground serves as a place to mess around with ideas for the main
game loop. game.rb currently just holds whatever classes that may be
necessary.
Add user input for choices

Expects user choice to be an integer within the index of choices. Additonally, parent modifying methods set to protected.
Add Shoes 4 to help quickly prototype a GUI
Clarify Message responsiblities
Add Game top level class
Add basic user name replacement