Proof of concept for version1
Create new classes for individuals and update constants for new kind of mutation
Add require statements, to_s method and remove chromosome
Update Game class
Refactor individuals to be DRY
Working simulation, but inadequate results
Better for debugging
Comment debugging messages
Add new individual type with short-term memory
Simulation sometime yields Tit-for-Tat strategy
Add new Individual type, with long-term memory
Bugfix max messages and find some good mutation constants
Merge pull request #1 from tudorpavel/vers1-proper

Proper version 1-3