MINOR Moved CurrentPageIdentifier from 'sapphire' to 'cms' module

code/CurrentPageIdentifier.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * This interface lets us set up objects that will tell us what the current page is.
+ * @package sapphire
+ * @subpackage model
+ */
+interface CurrentPageIdentifier {
+	/**
+	 * Get the current page ID.
+	 * @return int
+	 */
+	function currentPageID();
+	
+	/**
+	 * Check if the given DataObject is the current page.
+	 * @param DataObject $page The page to check.
+	 * @return boolean
+	 */
+	function isCurrentPage(DataObject $page);
+}
+
+?>