Merge pull request #44 from battlecode/hpmutate

Track HP change on mutate

Author: j-mao

engine/src/main/battlecode/world/InternalRobot.java

@@ -380,7 +380,9 @@ public void transform() {
     public void mutate() {
         if (!canMutate()) return;
         this.level++;
-        this.health += this.type.getMaxHealth(this.level) - this.type.getMaxHealth(this.level - 1);
+        int healthIncrease = this.type.getMaxHealth(this.level) - this.type.getMaxHealth(this.level - 1);
+        this.gameWorld.getMatchMaker().addAction(getID(), Action.CHANGE_HEALTH, healthIncrease);
+        this.health += healthIncrease;
     }
 
     /**