Implement missing FakeWorld methods

Essentials/src/main/java/com/earth2me/essentials/craftbukkit/FakeWorld.java

@@ -344,6 +344,21 @@ public class FakeWorld implements World {
         throw new UnsupportedOperationException("Not supported yet.");
     }
 
+    @Override
+    public boolean isClearWeather() {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
+    @Override
+    public void setClearWeatherDuration(int duration) {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
+    @Override
+    public int getClearWeatherDuration() {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
     @Override
     public Environment getEnvironment() {
         return env;