Finalized some fields, removed redundant code, various other fixes

src/main/java/fr/xephi/authme/converter/CrazyLoginConverter.java

@@ -18,9 +18,9 @@ import java.io.IOException;
  */
 public class CrazyLoginConverter implements Converter {
 
-    public AuthMe instance;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe instance;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for CrazyLoginConverter.

src/main/java/fr/xephi/authme/converter/FlatToSqlite.java

@@ -14,7 +14,7 @@ import java.sql.*;
  */
 public class FlatToSqlite implements Converter {
 
-    public CommandSender sender;
+    public final CommandSender sender;
     private String tableName;
     private String columnName;
     private String columnPassword;

src/main/java/fr/xephi/authme/converter/ForceFlatToSqlite.java

@@ -11,7 +11,7 @@ import fr.xephi.authme.settings.Settings;
  */
 public class ForceFlatToSqlite implements Converter {
 
-    private DataSource data;
+    private final DataSource data;
 
     /**
      * Constructor for ForceFlatToSqlite.

src/main/java/fr/xephi/authme/converter/RakamakConverter.java

@@ -23,9 +23,9 @@ import java.util.Map.Entry;
  */
 public class RakamakConverter implements Converter {
 
-    public AuthMe instance;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe instance;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for RakamakConverter.

src/main/java/fr/xephi/authme/converter/RoyalAuthConverter.java

@@ -12,8 +12,8 @@ import java.io.File;
  */
 public class RoyalAuthConverter implements Converter {
 
-    public AuthMe plugin;
-    private DataSource data;
+    public final AuthMe plugin;
+    private final DataSource data;
 
     /**
      * Constructor for RoyalAuthConverter.

src/main/java/fr/xephi/authme/converter/SqlToFlat.java

@@ -14,9 +14,9 @@ import java.util.List;
  */
 public class SqlToFlat implements Converter {
 
-    public AuthMe plugin;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe plugin;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for SqlToFlat.

src/main/java/fr/xephi/authme/converter/vAuthConverter.java

@@ -9,9 +9,9 @@ import org.bukkit.command.CommandSender;
  */
 public class vAuthConverter implements Converter {
 
-    public AuthMe plugin;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe plugin;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for vAuthConverter.

src/main/java/fr/xephi/authme/converter/vAuthFileReader.java

@@ -17,9 +17,9 @@ import java.util.UUID;
  */
 public class vAuthFileReader {
 
-    public AuthMe plugin;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe plugin;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for vAuthFileReader.
@@ -38,7 +38,7 @@ public class vAuthFileReader {
      *
      * @throws IOException
      */
-    public void convert() throws IOException {
+    public void convert() {
         final File file = new File(plugin.getDataFolder().getParent() + "" + File.separator + "vAuth" + File.separator + "passwords.yml");
         Scanner scanner;
         try {

src/main/java/fr/xephi/authme/converter/xAuthConverter.java

@@ -7,8 +7,8 @@ import org.bukkit.command.CommandSender;
  */
 public class xAuthConverter implements Converter {
 
-    public AuthMe plugin;
-    public CommandSender sender;
+    public final AuthMe plugin;
+    public final CommandSender sender;
 
     /**
      * Constructor for xAuthConverter.

src/main/java/fr/xephi/authme/converter/xAuthToFlat.java

@@ -20,9 +20,9 @@ import java.util.List;
  */
 public class xAuthToFlat {
 
-    public AuthMe instance;
-    public DataSource database;
-    public CommandSender sender;
+    public final AuthMe instance;
+    public final DataSource database;
+    public final CommandSender sender;
 
     /**
      * Constructor for xAuthToFlat.