Patch for WordPress 4.8.1

Problem: error or white screen on custom images Setting
Please merge this fix, thanks

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< wp_enqueue_style( self::$prefix . ‘settings_css’, $this->plugin_url() . ‘css/settings.css’ );

< 		wp_enqueue_style( self::$prefix . 'bootstrap_css', 	$this->plugin_url()  . 'css/nnr-bootstrap.min.css' );

< wp_enqueue_style( self::$prefix . ‘fontawesome_css’, $this->plugin_url() . ‘css/font-awesome.min.css’ );

---

> wp_enqueue_style( self::$prefix . ‘settings_css’, plugins_url(‘/’,__FILE__) . ‘css/settings.css’ );

> 		wp_enqueue_style( self::$prefix . 'bootstrap_css', 	plugins_url('/',__FILE__)  . 'css/nnr-bootstrap.min.css' );

> wp_enqueue_style( self::$prefix . ‘fontawesome_css’, plugins_url(‘/’,__FILE__) . ‘css/font-awesome.min.css’ );

224,225c224,225

< wp_enqueue_script( self::$prefix . ‘bootstrap_js’, $this->plugin_url() . ‘js/bootstrap.min.js’ );
< wp_enqueue_script( self::$prefix . 'settings_js',$this->plugin_url() . ‘js/settings.js’, array( ‘jquery’, ‘jquery-ui-sortable’ ) `);

---

> wp_enqueue_script( self::$prefix . ‘bootstrap_js’, plugins_url(‘/’,__FILE__) . ‘js/bootstrap.min.js’ );
> wp_enqueue_script( self::$prefix . 'settings_js',plugins_url(‘/’,__FILE__) . ‘js/settings.js’, array( ‘jquery’, ‘jquery-ui-sortable’ ) );