##Commit top level summary and short description:
- Iteration 3:
It had two commits:- Class-based implementation,
- For "bonus points" using Sinatra settings feature only, no class was used.
- Iteration 4:
It has all three features included:- HTML backgroun color as guess feedback,
- Restart game if secret number was found or if it was not found after five guesses,
- Cheat mode.