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/EntityFlying.java

@@ -0,0 +1,67 @@
+package net.minecraft.server;
+
+public class EntityFlying extends EntityLiving {
+
+    public EntityFlying(World world) {
+        super(world);
+    }
+
+    protected void a(float f) {}
+
+    public void c(float f, float f1) {
+        if (v()) {
+            a(f, f1, 0.02F);
+            c(s, t, u);
+            s *= 0.80000001192092896D;
+            t *= 0.80000001192092896D;
+            u *= 0.80000001192092896D;
+        } else if (x()) {
+            a(f, f1, 0.02F);
+            c(s, t, u);
+            s *= 0.5D;
+            t *= 0.5D;
+            u *= 0.5D;
+        } else {
+            float f2 = 0.91F;
+
+            if (A) {
+                f2 = 0.5460001F;
+                int i = l.a(MathHelper.b(p), MathHelper.b(z.b) - 1, MathHelper.b(r));
+
+                if (i > 0) {
+                    f2 = Block.m[i].bu * 0.91F;
+                }
+            }
+            float f3 = 0.1627714F / (f2 * f2 * f2);
+
+            a(f, f1, A ? 0.1F * f3 : 0.02F);
+            f2 = 0.91F;
+            if (A) {
+                f2 = 0.5460001F;
+                int j = l.a(MathHelper.b(p), MathHelper.b(z.b) - 1, MathHelper.b(r));
+
+                if (j > 0) {
+                    f2 = Block.m[j].bu * 0.91F;
+                }
+            }
+            c(s, t, u);
+            s *= f2;
+            t *= f2;
+            u *= f2;
+        }
+        bl = bm;
+        double d = p - m;
+        double d1 = r - o;
+        float f4 = MathHelper.a(d * d + d1 * d1) * 4F;
+
+        if (f4 > 1.0F) {
+            f4 = 1.0F;
+        }
+        bm += (f4 - bm) * 0.4F;
+        bn += bm;
+    }
+
+    public boolean m() {
+        return false;
+    }
+}