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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/admin/class-admin-asset-location.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin
+ */
+
+/**
+ * Represents a way to determine an assets location.
+ */
+interface WPSEO_Admin_Asset_Location {
+
+	/**
+	 * Determines the URL of the asset on the dev server.
+	 *
+	 * @param WPSEO_Admin_Asset $asset The asset to determine the URL for.
+	 * @param string            $type  The type of asset. Usually JS or CSS.
+	 *
+	 * @return string The URL of the asset.
+	 */
+	public function get_url( WPSEO_Admin_Asset $asset, $type );
+}