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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/admin/capabilities/class-capability-manager.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin\Capabilities
+ */
+
+/**
+ * Capability Manager interface.
+ */
+interface WPSEO_Capability_Manager {
+
+	/**
+	 * Registers a capability.
+	 *
+	 * @param string $capability Capability to register.
+	 * @param array  $roles      Roles to add the capability to.
+	 * @param bool   $overwrite  Optional. Use add or overwrite as registration method.
+	 */
+	public function register( $capability, array $roles, $overwrite = false );
+
+	/**
+	 * Adds the registerd capabilities to the system.
+	 */
+	public function add();
+
+	/**
+	 * Removes the registered capabilities from the system.
+	 */
+	public function remove();
+
+	/**
+	 * Returns the list of registered capabilities.
+	 *
+	 * @return string[] List of registered capabilities.
+	 */
+	public function get_capabilities();
+}