Merge pull request #1 from splitbrain-forks/php7-signature

Adjust method signatures to match parent

action.php

@@ -13,7 +13,7 @@
 
 class action_plugin_webmaster extends DokuWiki_Action_Plugin {
 
-    function register(&$controller) {
+    function register(Doku_Event_Handler $controller) {
         $controller->register_hook('TPL_METAHEADER_OUTPUT','BEFORE',$this,'addVerifyHeaders',array());
     }