Make SenseController a singleton.
Add support for player death.

Assets/Scripts/GameController.cs
Merge branch 'master' of github.com:crentagon/GGJ2014Senses

Conflicts:
	Assets/Scripts/SenseController.cs
Merge branch 'master' of github.com:crentagon/GGJ2014Senses
Add Scent-related tag.
Use 'Hazards' folder instead of 'Obstacles'; refactor obstacle obstruction/killing logic.
Merge branch 'master' of github.com:crentagon/GGJ2014Senses

Conflicts:
	Assets/Resources/Sign_2x1.prefab.meta
	Assets/Scripts/SenseController.cs