Refactored code to fix #roll and #score responsibilties
Refactored code to process rolls one 'frame' at a time
Spare
Renamed variable with more meaningful name
Extracted #spare?
Extracted roll_spare
Refactored Game to simplify problems caused by running off end of array
Bringing my code back in line with Uncle Bob's
Strike
Extracted methods for clarity
Perfect game
Refactored away roll_many method using x.times ruby idiom