Added Quests (logically)

-TODO: Add UI for the quests
-TODO: make craft, mine, gather, etc work for question.
-Look at fight.js for an example in how to make quest progress.
-Example quest of killing 1 Police man:
game.addQuest('Kill Police Man', 'A police man has been beating up all
your friends. Return him the favor.', false, [new Task('Kill 1 Police
Man', 'kill', '1 npc_policeMan')], function() { console.log("YAY!"); });
-Code has some help.