Merge pull request #11 from forrestbthomas/rules

add(RULES): Add RULES.md
fix(Game.js): Fix game messages.
Merge pull request #12 from gjtrowbridge/master

fix(Game.js): Fix game messages.
Make hero safer
feature(Game, Hero): Upload new game logic (healing, extra direct damage)
Merge pull request #13 from gjtrowbridge/update-game-logic

feature(Game, Hero): Upload new game logic (healing, extra direct damage)
fix(README): Decrease image size