public static function get_instance()
 {
     if (null == self::$instance) {
         self::$instance = new self();
     }
     return self::$instance;
 }
 private function __construct()
 {
     // Get pub instance of plugin
     $plugin = BoilerPlatePub::get_instance();
     $this->plugin_slug = $plugin->get_plugin_slug();
     $this->fs = $this->_init_filesystem();
     $this->_register_actions();
     $this->_register_filters();
 }