Merge pull request #23 from jamesyothers/master

configure package.json for npm test and covered game.js with tests
fix(Game.js): Fix killMessage and attackMessage to say which hero was attacked or killed
Merge pull request #24 from gjtrowbridge/message-fix

fix(Game.js): Fix killMessage and attackMessage to say which hero was at...
fix(gameRunner.js): Specify size of game for gameRunner.js
Merge pull request #25 from gjtrowbridge/add-game-size

fix(gameRunner.js): Specify size of game for gameRunner.js
add Circle.yml file