make the pjaxContainerId property as public

Author: Igor Chepurnoy

README.md

@@ -105,10 +105,11 @@ echo \yii2mod\comments\widgets\Comment::widget([
 
 echo \yii2mod\comments\widgets\Comment::widget([
         'model' => $model2,
-        'formId' => 'comment-form2'
+        'formId' => 'comment-form2',
+        'pjaxContainerId' => 'unique-pjax-container-id' // also you can set the `pjaxContainerId`
     ]); 
   ```
 
 #### Example comments
 -----
-![Alt text](http://res.cloudinary.com/zfort/image/upload/v1467214676/comments-preview.png "Example comments")
+![Alt text](http://res.cloudinary.com/zfort/image/upload/v1467214676/comments-preview.png "Example comments")

widgets/Comment.php

@@ -37,6 +37,11 @@ class Comment extends Widget
      */
     public $formId = 'comment-form';
 
+    /**
+     * @var string pjax container id
+     */
+    public $pjaxContainerId;
+
     /**
      * @var null|integer maximum comments level, level starts from 1, null - unlimited level;
      */
@@ -72,11 +77,6 @@ class Comment extends Widget
      */
     protected $encryptedEntityKey;
 
-    /**
-     * @var string pjax container id, generated automatically
-     */
-    protected $pjaxContainerId;
-
     /**
      * Initializes the widget params.
      */
@@ -86,7 +86,10 @@ public function init()
             throw new InvalidConfigException(Yii::t('yii2mod.comments', 'The "model" property must be set.'));
         }
 
-        $this->pjaxContainerId = ArrayHelper::getValue($this->clientOptions, 'pjaxContainerId', 'comment-pjax-container-' . $this->getId());
+        if (empty($this->pjaxContainerId)) {
+            $this->pjaxContainerId = 'comment-pjax-container-' . $this->getId();
+        }
+
         $this->entity = hash('crc32', get_class($this->model));
         $this->entityId = $this->model->{$this->entityIdAttribute};