Diminishing returns now has an optional minimum gains setting

src/main/java/com/gmail/nossr50/runnables/backups/CleanBackupsTask.java

@@ -1,20 +1,15 @@
 package com.gmail.nossr50.runnables.backups;
 
+import com.gmail.nossr50.config.Config;
+import com.gmail.nossr50.mcMMO;
+import org.bukkit.scheduler.BukkitRunnable;
+
 import java.io.File;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Calendar;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.List;
+import java.util.*;
 import java.util.concurrent.TimeUnit;
 
-import org.bukkit.scheduler.BukkitRunnable;
-
-import com.gmail.nossr50.mcMMO;
-import com.gmail.nossr50.config.Config;
-
 public class CleanBackupsTask extends BukkitRunnable {
     private static final String BACKUP_DIRECTORY = mcMMO.getMainDirectory() + "backup" + File.separator;
     private static final File BACKUP_DIR = new File(BACKUP_DIRECTORY);