Add check that all scores start at zero
Add test for number of strikes per game
Add calculation of strikes per game to Scorecard
Refactor constructor of Scorecard
Add check for non-infinite number of strikes per game
Remove dependence of Scorecard on localStorage
Add empty spec for ScorecardStorage
Add test for loading scores from storage
Fix broken test
Add ScorecardStorage
Refactor ScorecardStorage spec to be less coupled to Scorecard
Add test for saving scores in storage
Add saving of scores to storage