Improves writing speed when not using a GUI

Uses buffered writers instead of System.out
Uses a GUI for writing JarBuilder messages
Adds some missing comments to the jar builder

src/test/java/net/knarcraft/minecraftserverlauncher/userinterface/FakeGUI.java

@@ -1,19 +1,30 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
+import java.io.BufferedWriter;
 import java.io.File;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 
 public class FakeGUI extends MessageHandler implements GUI {
 
+    private final BufferedWriter writer;
+
     /***
      * Initializes a new fake gui
      */
     public FakeGUI() {
         super(true);
+        this.writer = new BufferedWriter(new OutputStreamWriter(System.out));
     }
 
     @Override
     public void setStatus(String message) {
-        System.out.println(message);
+        try {
+            writer.write(message);
+            writer.flush();
+        } catch (IOException e) {
+            System.out.println(message);
+        }
     }
 
     @Override