Adding all Entities into CraftBukkit.

These are needed to properly allow for determining class type, in
accordance with current practice.

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

@@ -0,0 +1,96 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+public class EntityCreeper extends EntityMobs {
+
+    int a;
+    int b;
+
+    public EntityCreeper(World world) {
+        super(world);
+        aP = "/mob/creeper.png";
+    }
+
+    protected void a() {
+        super.a();
+        af.a(16, ((Byte.valueOf((byte) -1))));
+    }
+
+    public void a(NBTTagCompound nbttagcompound) {
+        super.a(nbttagcompound);
+    }
+
+    public void b(NBTTagCompound nbttagcompound) {
+        super.b(nbttagcompound);
+    }
+
+    public void b_() {
+        b = a;
+        if (l.z) {
+            int i = K();
+
+            if (i > 0 && a == 0) {
+                l.a(((Entity) (this)), "random.fuse", 1.0F, 0.5F);
+            }
+            a += i;
+            if (a < 0) {
+                a = 0;
+            }
+            if (a >= 30) {
+                a = 30;
+            }
+        }
+        super.b_();
+    }
+
+    protected String f() {
+        return "mob.creeper";
+    }
+
+    protected String g() {
+        return "mob.creeperdeath";
+    }
+
+    public void f(Entity entity) {
+        super.f(entity);
+        if (entity instanceof EntitySkeleton) {
+            a(Item.aY.ba + W.nextInt(2), 1);
+        }
+    }
+
+    protected void a(Entity entity, float f1) {
+        int i = K();
+
+        if (i <= 0 && f1 < 3F || i > 0 && f1 < 7F) {
+            if (a == 0) {
+                l.a(((Entity) (this)), "random.fuse", 1.0F, 0.5F);
+            }
+            a(1);
+            a++;
+            if (a >= 30) {
+                l.a(((Entity) (this)), p, q, r, 3F);
+                q();
+            }
+            e = true;
+        } else {
+            a(-1);
+            a--;
+            if (a < 0) {
+                a = 0;
+            }
+        }
+    }
+
+    protected int h() {
+        return Item.K.ba;
+    }
+
+    private int K() {
+        return ((int) (af.a(16)));
+    }
+
+    private void a(int i) {
+        af.b(16, ((Byte.valueOf((byte) i))));
+    }
+}