Implemented the logout command

src/main/java/fr/xephi/authme/command/executable/logout/LogoutCommand.java

@@ -0,0 +1,37 @@
+package fr.xephi.authme.command.executable.logout;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class LogoutCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance
+        final Player player = (Player) sender;
+
+        // Logout the player
+        plugin.management.performLogout(player);
+        return true;
+    }
+}