Added World.strikeLightningEffect() that does no damage.

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

@@ -371,6 +371,12 @@ public class CraftWorld implements World {
         return new CraftLightningStrike(server, lightning);
     }
 
+    public LightningStrike strikeLightningEffect(Location loc) {
+        EntityWeatherStorm lightning = new EntityWeatherStorm(world, loc.getX(), loc.getY(), loc.getZ(), true);
+        world.a(lightning);
+        return new CraftLightningStrike(server, lightning);
+    }
+
     public boolean generateTree(Location loc, TreeType type) {
         return generateTree(loc, type, world);
     }

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

@@ -14,4 +14,8 @@ public class CraftLightningStrike extends CraftEntity implements LightningStrike
     public EntityWeatherStorm getHandle() {
         return (EntityWeatherStorm)super.getHandle();
     }
+
+    public boolean isEffect() {
+        return ((EntityWeatherStorm) super.getHandle()).isEffect;
+    }
 }