Update README and metadata for version 1.1.1; add discovery test for plugin class loading

plugin.php

@@ -1,12 +1,13 @@
 <?php
 
-require_once __DIR__ . "/importer.php";
-
 class pluginBluditGithub extends Plugin
 {
     private $importing = false;
     public function init()
     {
+        // Bludit discovers every class declared while including plugin.php.
+        // Load helpers only after that discovery pass has finished.
+        require_once __DIR__ . "/importer.php";
         $this->dbFields = [
             'token'                 => '',
             'owner'                 => '',