Add Person class with methods run, scream, and drink_coffee
Add PowerRanger class with punch and rest methods. Not included: use_megazord.
Add EvilNinja class with punch and cause_mayhem methods.
Add use_megazord method to PowerRanger class.
Move punch method to Fight module for PowerRanger and EvilNinja classes.
Add fight_scene method to Fight module, test for fight_scene.
Add documentation (incomplete).