Added World.strikeLightningEffect() that does no damage.

src/main/java/org/bukkit/entity/LightningStrike.java

@@ -2,8 +2,17 @@
 package org.bukkit.entity;
 
 /**
- * Represents an instance of a lightning strike entity
+ * Represents an instance of a lightning strike. May or may not do damage.
+ * 
+ * @author sk89q
  */
 public interface LightningStrike extends Weather {
-
+    
+    /**
+     * Returns whether the strike is an effect that does no damage.
+     * 
+     * @return whether the strike is an effect
+     */
+    public boolean isEffect();
+    
 }