Added version checking and fixed a server shutdown issue

Added version checking to ensure a user is on the most current version of sync,
Fixed issue where closing sync after starting a server would keep the program running.
Small changes to documentation.

sync/src/com/kirinpatel/Main.java

@@ -4,6 +4,7 @@
 import com.kirinpatel.net.Server;
 import com.kirinpatel.util.Debug;
 import com.kirinpatel.util.UIMessage;
+import com.kirinpatel.util.VersionChecker;
 
 import javax.swing.*;
 import java.awt.*;
@@ -70,17 +71,22 @@ public Main() {
      * @param args Command line arguments
      */
     public static void main(String[] args) {
-        try {
-            for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
-                if ("Nimbus".equals(info.getName())) {
-                    UIManager.setLookAndFeel(info.getClassName());
-                    break;
+        if (VersionChecker.isUpdated()) {
+            try {
+                for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
+                    if ("Nimbus".equals(info.getName())) {
+                        UIManager.setLookAndFeel(info.getClassName());
+                        break;
+                    }
                 }
+            } catch (Exception e) {
+
             }
-        } catch (Exception e) {
-            // If Nimbus is not available, you can set the GUI to another look and feel.
+            main = new Main();
+        } else {
+            Debug.Log("Outdated version of sync! Please update!", 2);
+            new UIMessage("Outdated version of sync!", "You have an outdated version of sync, please update sync!", 1);
         }
-        main = new Main();
     }
 
     /**

sync/src/com/kirinpatel/net/Server.java

@@ -37,8 +37,8 @@ public Server() {
         new Thread(() -> {
             try {
                 Thread.sleep(5000);
-                PortValidator.isAvailable(8000);
-                PortValidator.isAvailable(8080);
+                if(isRunning) PortValidator.isAvailable(8000);
+                if(isRunning) PortValidator.isAvailable(8080);
             } catch(InterruptedException e) {
                 e.printStackTrace();
             }

sync/src/com/kirinpatel/util/PortValidator.java

@@ -20,6 +20,7 @@ public static void isAvailable(int port) {
             Debug.Log("Error testing connection on port (" + port + ").", 5);
             if (port == 8000) new UIMessage("A port is not forwarded!", "Clients will be unable to connect to your sync server! Please open port " + port + ".", 1);
             else new UIMessage("A port is not forwarded!", "You will be unable to use offline media! Please open port " + port + " to use offline media.", 1);
+            Server.stop();
         } finally {
             if (s != null) {
                 try {

sync/src/com/kirinpatel/util/VersionChecker.java

@@ -0,0 +1,51 @@
+package com.kirinpatel.util;
+
+import jdk.nashorn.api.scripting.URLReader;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Scanner;
+
+public class VersionChecker {
+
+    private final static int VERSION = 1;
+    private final static int BUILD = 3;
+    private final static int REVISION = 1;
+
+    public static boolean isUpdated() {
+        try {
+            Scanner s = new Scanner(new URLReader(new URL("https://github.com/ajchili/sync/releases")));
+            String version = "";
+            while (s.hasNext()) {
+                String line = s.nextLine();
+                if (line.contains("tag-reference")) {
+                    s.nextLine();
+                    version = s.nextLine();
+                    version = version.substring(version.indexOf("tree/") + 5, version.indexOf("tree/") + 10);
+                    break;
+                }
+            }
+
+            for (int i = 0; i < 5; i += 2) {
+                int parsedInt = Integer.parseInt(version.substring(i, i + 1));
+                switch(i) {
+                    case 0:
+                        if (parsedInt != VERSION) return false;
+                        break;
+                    case 2:
+                        if (parsedInt != BUILD) return false;
+                        break;
+                    case 4:
+                        if (parsedInt != REVISION) return false;
+                        break;
+                    default:
+                        break;
+                }
+            }
+        } catch(MalformedURLException e) {
+            e.printStackTrace();
+        }
+
+        return true;
+    }
+}

sync/src/com/kirinpatel/vlc/MediaPlayer.java

@@ -24,6 +24,9 @@
 import java.awt.image.AffineTransformOp;
 import java.awt.image.BufferedImage;
 
+/**
+ * Modified JPanel that will play media for the sync application.
+ */
 public class MediaPlayer extends JPanel {
 
     private final int WIDTH;
@@ -40,6 +43,11 @@ public class MediaPlayer extends JPanel {
     private boolean isScrubbing = false;
     private boolean isFile = false;
 
+    /**
+     * Constructor that will return a MediaPlayer.
+     *
+     * @param playbackPanel Returns MediaPanel
+     */
     public MediaPlayer(PlaybackPanel playbackPanel) {
         new NativeDiscovery().discover();
         Debug.Log("Creating MediaPlayer...", 6);
@@ -65,6 +73,9 @@ protected RenderCallback onGetRenderCallback() {
         Debug.Log("MediaPlayer created.", 6);
     }
 
+    /**
+     * Initialize media controls or reset them after media is changed.
+     */
     private void initControls() {
         Debug.Log("Initializing media player controls...", 3);
         if (playbackPanel.type == 0 && playbackPanel.mediaPosition.getMaximum() != 1000) {