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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/admin/roles/class-role-manager.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin\Roles
+ */
+
+/**
+ * Role Manager interface.
+ */
+interface WPSEO_Role_Manager {
+
+	/**
+	 * Registers a role.
+	 *
+	 * @param string      $role         Role to register.
+	 * @param string      $display_name Display name to use.
+	 * @param string|null $template     Optional. Role to base the new role on.
+	 *
+	 * @return void
+	 */
+	public function register( $role, $display_name, $template = null );
+
+	/**
+	 * Adds the registered roles.
+	 *
+	 * @return void
+	 */
+	public function add();
+
+	/**
+	 * Removes the registered roles.
+	 *
+	 * @return void
+	 */
+	public function remove();
+
+	/**
+	 * Returns the list of registered roles.
+	 *
+	 * @return string[] List or registered roles.
+	 */
+	public function get_roles();
+}