Merge pull request #2 from Jazztoken/master

Unify city naming into one method with pattern matching.
Added base class to unify stat generators. Added module for S&W.
Refactored code to uniformly treat RPG systems. Added utils to list and load systems.
Merge pull request #3 from muscar/alex-dev

Refactored code to uniformly treat RPG systems. Added utils to list and load systems. Added base class to unify stat generators. Added module for S&W.