Generic cleanup of warnings, whitespace and style.

src/main/java/org/bukkit/event/player/PlayerKickEvent.java

@@ -6,6 +6,7 @@ import org.bukkit.event.Cancellable;
 /**
  * Called when a player gets kicked from the server
  */
+@SuppressWarnings("serial")
 public class PlayerKickEvent extends PlayerEvent implements Cancellable {
     private String leaveMessage;
     private String kickReason;