Adding isSmoked method
Adding private properties health, poisoned
Adding private functions
Adding health getter
Adding givePoison and giveAntidote methods
Adding feed method
Merge branch 'master' of github.com:allouis/mackerel.js

* 'master' of github.com:allouis/mackerel.js:
  Eating array and function
  Added canBreathe method (important)
  Update mackerel.js

Conflicts:
	mackerel.js