Added a lot of events relating to weather, including those for entities. Thanks wizjany!

src/main/java/org/bukkit/event/weather/WeatherEvent.java

@@ -0,0 +1,24 @@
+package org.bukkit.event.weather;
+
+import org.bukkit.World;
+import org.bukkit.event.Event;
+
+/**
+ * Represents an Weather-related event
+ */
+public class WeatherEvent extends Event {
+    protected World world;
+
+    public WeatherEvent(final Event.Type type, final World where) {
+        super(type);
+        world = where;
+    }
+
+    /**
+     * Returns the World where this event is occuring
+     * @return World this event is occuring in
+     */
+    public final World getWorld() {
+        return world;
+    }
+}