Enhancements to game UI mechanics

- Alert messages are now embedded/injected HTML.
- Consolidated all user messages into one div (#notif-msg).
- New end game result!
- New start-over mechanics.
- Some code refactoring to accomodate above changes.
Commit bug to starting a new game

- Moved level reset to top of click for start-game.
Merge pull request #2 from mjeff/enhancements

Enhancements to game UI mechanics