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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/inc/interface-wpseo-wordpress-integration.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO
+ */
+
+if ( ! interface_exists( 'WPSEO_WordPress_Integration' ) ) {
+	/**
+	 * An interface for registering integrations with WordPress.
+	 */
+	interface WPSEO_WordPress_Integration {
+
+		/**
+		 * Registers all hooks to WordPress.
+		 *
+		 * @return void
+		 */
+		public function register_hooks();
+	}
+}