- Adding score system mmodule. You can store scores in a MySQL DB if
  available or simply use an array if the DB is unreachable
- Adding new birds sprites
- Refactoring pipe class
- Add rotation on birds
- Adding a night cycle. If score > 20, a smooth transition to night BG is
  perform
- Update Parallax class
- Improve code and fix some bug when players wait in login screen
- Delete unuse pictures