Refactored Baseketball and Football specs

GameSpec.js

describe("games", function() {
  subject("game", function() { game });
  describe("Basketball Game", function() {
    given(game, function() { new BasketballGame(); });
    its("fieldGoal.points", function() { expect.toEqual(2); });
  })
  describe("Football Game", function() {
    given(game, function() { new FootballGame(); });
    its("fieldGoal.points", function() { expect.toEqual(3); });
  });
});