Fixed CraftLivingEntity.damage when the entity is an EntityComplex.

Fixes BUKKIT-589: if you call damage on an instance of EnderDragon, no damage
is done.

Reason for bug: damage calls Entity.damageEntity.  But EntityComplex
overrides damageEntity to do nothing.

Fix: CraftComplexLiving should call EntityComplex.e instead of
Entity.damageEntity.  e is the method that actually does damage to an
instance of EntityComplex.

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

@@ -0,0 +1,26 @@
+package net.minecraft.server;
+
+public class EntityComplex extends EntityLiving {
+
+    protected int t = 100;
+
+    public EntityComplex(World world) {
+        super(world);
+    }
+
+    public int getMaxHealth() {
+        return this.t;
+    }
+
+    public boolean a(EntityComplexPart entitycomplexpart, DamageSource damagesource, int i) {
+        return this.damageEntity(damagesource, i);
+    }
+
+    public boolean damageEntity(DamageSource damagesource, int i) {
+        return false;
+    }
+
+    public boolean e(DamageSource damagesource, int i) { // CraftBukkit - protected -> public
+        return super.damageEntity(damagesource, i);
+    }
+}