Using MCore DiscUtil is easy enough since it was backported.

src/com/massivecraft/factions/Board.java

@@ -13,12 +13,12 @@ import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
 
+import com.massivecraft.mcore.util.DiscUtil;
 import com.massivecraft.mcore.util.Txt;
 import com.massivecraft.mcore.xlib.gson.reflect.TypeToken;
 import com.massivecraft.factions.integration.LWCFeatures;
 import com.massivecraft.factions.iface.RelationParticipator;
 import com.massivecraft.factions.util.AsciiCompass;
-import com.massivecraft.factions.zcore.util.DiscUtil;
 
 
 public class Board

src/com/massivecraft/factions/zcore/persist/EntityCollection.java

@@ -7,8 +7,8 @@ import java.util.logging.Level;
 import java.util.Map.Entry;
 
 import org.bukkit.Bukkit;
-import com.massivecraft.factions.zcore.util.DiscUtil;
 import com.massivecraft.factions.zcore.util.TextUtil;
+import com.massivecraft.mcore.util.DiscUtil;
 import com.massivecraft.mcore.xlib.gson.Gson;
 import com.massivecraft.mcore.xlib.gson.JsonSyntaxException;
 

src/com/massivecraft/factions/zcore/util/DiscUtil.java

@@ -1,160 +0,0 @@
-package com.massivecraft.factions.zcore.util;
-
-import java.io.*;
-import java.net.URL;
-import java.nio.channels.Channels;
-import java.nio.channels.ReadableByteChannel;
-
-public class DiscUtil
-{
-	// -------------------------------------------- //
-	// CONSTANTS
-	// -------------------------------------------- //
-	
-	private final static String UTF8 = "UTF-8";
-	
-	// -------------------------------------------- //
-	// BYTE 
-	// -------------------------------------------- //
-	
-	public static byte[] readBytes(File file) throws IOException
-	{
-		int length = (int) file.length();
-		byte[] output = new byte[length];
-		InputStream in = new FileInputStream(file);
-		int offset = 0;
-		// normally it should be able to read the entire file with just a single iteration below, but it depends on the whims of the FileInputStream
-		while (offset < length)
-		{
-			offset += in.read(output, offset, (length - offset));
-		}
-		in.close();
-		return output;
-	}
-	
-	public static void writeBytes(File file, byte[] bytes) throws IOException
-	{
-		FileOutputStream out = new FileOutputStream(file);
-		out.write(bytes);
-		out.close();
-	}
-	
-	// -------------------------------------------- //
-	// STRING
-	// -------------------------------------------- //
-	
-	public static void write(File file, String content) throws IOException
-	{
-		writeBytes(file, utf8(content));
-	}
-	
-	public static String read(File file) throws IOException
-	{
-		return utf8(readBytes(file));
-	}
-	
-	// -------------------------------------------- //
-	// CATCH
-	// -------------------------------------------- //
-	
-	public static boolean writeCatch(File file, String content)
-	{
-		try
-		{
-			write(file, content);
-			return true;
-		}
-		catch (Exception e)
-		{
-			return false;
-		}
-	}
-	
-	public static String readCatch(File file)
-	{
-		try
-		{
-			return read(file);
-		}
-		catch (IOException e)
-		{
-			return null;
-		}
-	}
-	
-	// -------------------------------------------- //
-	// DOWNLOAD
-	// -------------------------------------------- //
-	
-	public static boolean downloadUrl(String urlstring, File file)
-	{
-		try
-		{
-			URL url = new URL(urlstring);
-			ReadableByteChannel rbc = Channels.newChannel(url.openStream());
-			FileOutputStream fos = new FileOutputStream(file);
-			fos.getChannel().transferFrom(rbc, 0, 1 << 24);
-			fos.close();
-			return true;
-		}
-		catch (Exception e)
-		{
-			e.printStackTrace();
-			return false;
-		}
-	}
-	
-	public static boolean downloadUrl(String urlstring, String filename)
-	{
-		return downloadUrl(urlstring, new File(filename));
-	}
-	
-	// -------------------------------------------- //
-	// FILE DELETION
-	// -------------------------------------------- //
-	
-    public static boolean deleteRecursive(File path) throws FileNotFoundException
-    {
-        if ( ! path.exists()) throw new FileNotFoundException(path.getAbsolutePath());
-        boolean ret = true;
-        if (path.isDirectory())
-        {
-            for (File f : path.listFiles())
-            {
-                ret = ret && deleteRecursive(f);
-            }
-        }
-        return ret && path.delete();
-    }
-    
-	// -------------------------------------------- //
-	// UTF8 ENCODE AND DECODE
-	// -------------------------------------------- //
-    
-	public static byte[] utf8(String string)
-	{
-	    try
-		{
-			return string.getBytes(UTF8);
-		}
-		catch (UnsupportedEncodingException e)
-		{
-			e.printStackTrace();
-			return null;
-		}
-	}
-    
-	public static String utf8(byte[] bytes)
-	{
-	    try
-		{
-			return new String(bytes, UTF8);
-		}
-		catch (UnsupportedEncodingException e)
-		{
-			e.printStackTrace();
-			return null;
-		}
-	}
-
-}

src/com/massivecraft/factions/zcore/util/LibLoader.java

@@ -3,6 +3,7 @@ package com.massivecraft.factions.zcore.util;
 import java.io.File;
 
 import com.massivecraft.factions.zcore.MPlugin;
+import com.massivecraft.mcore.util.DiscUtil;
 
 public class LibLoader
 {	

src/com/massivecraft/factions/zcore/util/Persist.java

@@ -5,6 +5,7 @@ import java.lang.reflect.Type;
 import java.util.logging.Level;
 
 import com.massivecraft.factions.zcore.MPlugin;
+import com.massivecraft.mcore.util.DiscUtil;
 
 // TODO: Give better name and place to differenciate from the entity-orm-ish system in "com.massivecraft.core.persist".