Added critical hit boolean check and unit receiveDamage function

Assets/UnitBehaviour.cs

@@ -64,10 +64,21 @@ public class UnitBehaviour : MonoBehaviour {
 		attackElem = e;
 	}
 
-	bool attack() {
+	bool attackHit() {
 		return (Random.Range (0, 100) < precision);
 	}
 
+	bool criticalHit() {
+		return (Random.Range (0, 100) < critChance);
+	}
+
+	void receiveDamage(int damage) {
+		if (health <= damage)
+			Die ();
+		else
+			health -= damage;
+	}
+
 	// Use this for initialization
 	void Start () {