Implemented new EnderCrystal entity class

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -730,6 +730,9 @@ public class CraftWorld implements World {
             }
         } else if (EnderSignal.class.isAssignableFrom(clazz)) {
             entity = new EntityEnderSignal(world, x, y, z);
+        } else if (EnderCrystal.class.isAssignableFrom(clazz)) {
+            entity = new EntityEnderCrystal(world);
+            entity.setPositionRotation(x, y, z, 0, 0);
         } else if (LivingEntity.class.isAssignableFrom(clazz)) {
             if (Chicken.class.isAssignableFrom(clazz)) {
                 entity = new EntityChicken(world);

src/main/java/org/bukkit/craftbukkit/entity/CraftEnderCrystal.java

@@ -0,0 +1,16 @@
+package org.bukkit.craftbukkit.entity;
+
+import net.minecraft.server.Entity;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.entity.EnderSignal;
+
+public class CraftEnderCrystal extends CraftEntity implements EnderSignal {
+    public CraftEnderCrystal(CraftServer server, Entity entity) {
+        super(server, entity);
+    }
+
+    @Override
+    public String toString() {
+        return "CraftEnderSignal";
+    }
+}

src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java

@@ -110,6 +110,7 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
             else { return new CraftFireball(server, (EntityFireball) entity); }
         }
         else if (entity instanceof EntityEnderSignal) { return new CraftEnderSignal(server, (EntityEnderSignal) entity); }
+        else if (entity instanceof EntityEnderCrystal) { return new CraftEnderCrystal(server, (EntityEnderCrystal) entity); }
         else if (entity instanceof EntityFishingHook) { return new CraftFish(server, (EntityFishingHook) entity); }
         else if (entity instanceof EntityItem) { return new CraftItem(server, (EntityItem) entity); }
         else if (entity instanceof EntityWeather) {