Fixed Helper bugs

Qii/Autoloader/Helper.php

@@ -57,6 +57,8 @@ class Helper
         foreach (glob(str_replace("//", DS, $appPath . DS . 'helper' . DS . '*.php'), GLOB_BRACE) AS $file) {
             if(\Qii\Autoloader\Import::requires($file)){
                 //如果里边包含class的话就将class注册到Qii::instance('class');
+                $className = 'helper\\'. pathinfo($file)['filename'];
+                //echo substr($file, stristr($file, 'helper'), strlen($file));
                 if (class_exists($className, false)) {
                     self::$helpers[$className] = \Qii\Autoloader\Psr4::getInstance()->instance($className);
                 }