Addition of all Entity classes.

Each Entity creates a corresponding instance of a Craft Entity, to be
used whenever sending instances to an event handler with
getBukkitEntity().

src/main/java/net/minecraft/server/EntityZombieSimple.java

@@ -1,5 +1,8 @@
 package net.minecraft.server;
 
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.entity.CraftGiant;
+
 public class EntityZombieSimple extends EntityMobs {
 
     public EntityZombieSimple(World world) {
@@ -10,6 +13,10 @@ public class EntityZombieSimple extends EntityMobs {
         aZ *= 10;
         H *= 6F;
         a(I * 6F, J * 6F);
+        //CraftBukkit start
+        CraftServer server = ((WorldServer) this.l).getServer();
+        this.bukkitEntity = new CraftGiant(server, this);
+        //CraftBukkit end
     }
 
     protected float a(int i, int j, int k) {