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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/admin/views/interface-yoast-form-element.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin
+ */
+
+/**
+ * Generate the HTML for a form element.
+ */
+interface Yoast_Form_Element {
+
+	/**
+	 * Return the HTML for the form element.
+	 *
+	 * @return string
+	 */
+	public function get_html();
+}