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/EntitySheep.java

@@ -0,0 +1,129 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+public class EntitySheep extends EntityAnimals {
+
+    public static final float a[][] = {
+        {
+            1.0F, 1.0F, 1.0F
+        }, {
+            0.95F, 0.7F, 0.2F
+        }, {
+            0.9F, 0.5F, 0.85F
+        }, {
+            0.6F, 0.7F, 0.95F
+        }, {
+            0.9F, 0.9F, 0.2F
+        }, {
+            0.5F, 0.8F, 0.1F
+        }, {
+            0.95F, 0.7F, 0.8F
+        }, {
+            0.3F, 0.3F, 0.3F
+        }, {
+            0.6F, 0.6F, 0.6F
+        }, {
+            0.3F, 0.6F, 0.7F
+        }, {
+            0.7F, 0.4F, 0.9F
+        }, {
+            0.2F, 0.4F, 0.8F
+        }, {
+            0.5F, 0.4F, 0.3F
+        }, {
+            0.4F, 0.5F, 0.2F
+        }, {
+            0.8F, 0.3F, 0.3F
+        }, {
+            0.1F, 0.1F, 0.1F
+        }
+    };
+
+    public EntitySheep(World world) {
+        super(world);
+        aP = "/mob/sheep.png";
+        a(0.9F, 1.3F);
+    }
+
+    protected void a() {
+        super.a();
+        af.a(16, ((new Byte((byte) 0))));
+    }
+
+    public boolean a(Entity entity, int i) {
+        if (!l.z && !f_() && (entity instanceof EntityLiving)) {
+            a(true);
+            int j = 1 + W.nextInt(3);
+
+            for (int k = 0; k < j; k++) {
+                EntityItem entityitem = a(new ItemStack(Block.ab.bi, 1, e_()), 1.0F);
+
+                entityitem.t += W.nextFloat() * 0.05F;
+                entityitem.s += (W.nextFloat() - W.nextFloat()) * 0.1F;
+                entityitem.u += (W.nextFloat() - W.nextFloat()) * 0.1F;
+            }
+        }
+        return super.a(entity, i);
+    }
+
+    public void a(NBTTagCompound nbttagcompound) {
+        super.a(nbttagcompound);
+        nbttagcompound.a("Sheared", f_());
+        nbttagcompound.a("Color", (byte) e_());
+    }
+
+    public void b(NBTTagCompound nbttagcompound) {
+        super.b(nbttagcompound);
+        a(nbttagcompound.l("Sheared"));
+        a(((int) (nbttagcompound.b("Color"))));
+    }
+
+    protected String e() {
+        return "mob.sheep";
+    }
+
+    protected String f() {
+        return "mob.sheep";
+    }
+
+    protected String g() {
+        return "mob.sheep";
+    }
+
+    public int e_() {
+        return af.a(16) & 0xf;
+    }
+
+    public void a(int i) {
+        byte byte0 = af.a(16);
+
+        af.b(16, ((Byte.valueOf((byte) (byte0 & 0xf0 | i & 0xf)))));
+    }
+
+    public boolean f_() {
+        return (af.a(16) & 0x10) != 0;
+    }
+
+    public void a(boolean flag) {
+        byte byte0 = af.a(16);
+
+        if (flag) {
+            af.b(16, ((Byte.valueOf((byte) (byte0 | 0x10)))));
+        } else {
+            af.b(16, ((Byte.valueOf((byte) (byte0 & 0xffffffef)))));
+        }
+    }
+
+    public static int a(Random random) {
+        int i = random.nextInt(100);
+
+        if (i < 5) {
+            return 15;
+        }
+        if (i < 10) {
+            return 7;
+        }
+        return i >= 15 ? 0 : 8;
+    }
+}