Implement SpectralArrow entity

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

@@ -142,6 +142,7 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         	if (((EntityTippedArrow) entity).isTipped()) { return new CraftTippedArrow(server, (EntityTippedArrow) entity); }
         	else { return new CraftArrow(server, (EntityArrow) entity); }
         }
+        else if (entity instanceof EntitySpectralArrow) { return new CraftSpectralArrow(server, (EntitySpectralArrow) entity); }
         else if (entity instanceof EntityArrow) { return new CraftArrow(server, (EntityArrow) entity); }
         else if (entity instanceof EntityBoat) { return new CraftBoat(server, (EntityBoat) entity); }
         else if (entity instanceof EntityProjectile) {

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

@@ -0,0 +1,28 @@
+package org.bukkit.craftbukkit.entity;
+
+import net.minecraft.server.EntitySpectralArrow;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.SpectralArrow;
+
+public class CraftSpectralArrow extends CraftArrow implements SpectralArrow {
+
+    public CraftSpectralArrow(CraftServer server, EntitySpectralArrow entity) {
+        super(server, entity);
+    }
+
+    @Override
+    public EntitySpectralArrow getHandle() {
+        return (EntitySpectralArrow) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftSpectralArrow";
+    }
+
+    @Override
+    public EntityType getType() {
+        return EntityType.SPECTRAL_ARROW;
+    }
+}