Added World.strikeLightning(). Also renamed WeatherStorm -> LightningStrike.

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

@@ -0,0 +1,9 @@
+
+package org.bukkit.entity;
+
+/**
+ * Represents an instance of a lightning strike entity
+ */
+public interface LightningStrike extends Weather {
+
+}