- added 'Home' and 'Replay' buttons
- show a level as 'Solved' when visiting an already solved level
- track the best solution provided for each level
- persisting 'selectedLevel' and 'bestSolutions' to local storage
-- on 'beforeunload' event: save state
-- on $stateChangeState event: restore state the first time this event is triggered
- WIP: show score out of 3 stars for each solved level
- v0.0.1