add include_plugin function for optoinal plugins

JohnDoh

2014-08-16 4eee212883b34e1ca7cfb9466580ff20dca5c979

 program/lib/Roundcube/rcube_html2text.php

@@ -423,7 +423,7 @@
        // Variables used for building the link list
        $this->_link_list = array();

        $text = trim(stripslashes($this->html));
        $text = $this->html;

        // Convert HTML to TXT
        $this->_converter($text);