Clean up BukkitUtil.

src/bukkit/java/com/sk89q/worldedit/bukkit/BukkitUtil.java

@@ -43,7 +43,7 @@ import org.bukkit.material.Dye;
 
 import java.util.List;
 
-public class BukkitUtil {
+public final class BukkitUtil {
 
     private BukkitUtil() {
     }
@@ -101,7 +101,7 @@ public class BukkitUtil {
 
     public static Player matchSinglePlayer(Server server, String name) {
         List<Player> players = server.matchPlayer(name);
-        if (players.size() == 0) {
+        if (players.isEmpty()) {
             return null;
         }
         return players.get(0);