Merge pull request paquettg#88 from yangxikun/master

fix clear() bug

Author: paquettg

src/PHPHtmlParser/Dom/AbstractNode.php

@@ -162,9 +162,6 @@ public function setParent(InnerNode $parent)
         // assign child to parent
         $this->parent->addChild($this);
 
-        //clear any cache
-        $this->clear();
-
         return $this;
     }
 

src/PHPHtmlParser/Dom/HtmlNode.php

@@ -186,6 +186,7 @@ protected function clear()
         $this->innerHtml = null;
         $this->outerHtml = null;
         $this->text      = null;
+
         if (is_null($this->parent) === false) {
             $this->parent->clear();
         }