Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/presenters/webmaster/yandex-presenter.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Yoast\WP\SEO\Presenters\Webmaster;
+
+use Yoast\WP\SEO\Presenters\Abstract_Indexable_Tag_Presenter;
+
+/**
+ * Presenter class for the Yandex Webmaster verification setting.
+ */
+class Yandex_Presenter extends Abstract_Indexable_Tag_Presenter {
+
+	/**
+	 * The tag key name.
+	 *
+	 * @var string
+	 */
+	protected $key = 'yandex-verification';
+
+	/**
+	 * Retrieves the webmaster tool site verification value from the settings.
+	 *
+	 * @return string The webmaster tool site verification value.
+	 */
+	public function get() {
+		return $this->helpers->options->get( 'yandexverify', '' );
+	}
+}