Fix Craft Entity constructors and toStrings.

Also, standardise getHandle and clean up in general.
getHandle is now using the 'entity' member variable instead of
super.getHandle, as this reduces the number of chained calls needed.

src/main/java/org/bukkit/craftbukkit/entity/CraftPigZombie.java

@@ -11,16 +11,6 @@ public class CraftPigZombie extends CraftZombie implements PigZombie {
         super(server, entity);
     }
 
-    @Override
-    public EntityPigZombie getHandle() {
-        return (EntityPigZombie) super.getHandle();
-    }
-
-    @Override
-    public String toString() {
-        return "CraftPigZombie";
-    }
-
     public int getAnger() {
         return getHandle().angerLevel;
     }
@@ -37,4 +27,13 @@ public class CraftPigZombie extends CraftZombie implements PigZombie {
         return getAnger() > 0;
     }
 
+    @Override
+    public EntityPigZombie getHandle() {
+        return (EntityPigZombie) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftPigZombie";
+    }
 }