make some of the Webfinger magic strings constants

plugins/OStatus/lib/webfinger.php

@@ -32,11 +32,16 @@ define('WEBFINGER_SERVICE_REL_VALUE', 'lrdd');
 /**
  * Implement the webfinger protocol.
  */
+
 class Webfinger
 {
+    const PROFILEPAGE = 'http://webfinger.net/rel/profile-page';
+    const UPDATESFROM = 'http://schemas.google.com/g/2010#updates-from';
+
     /**
      * Perform a webfinger lookup given an account.
      */
+
     public function lookup($id)
     {
         $id = $this->normalize($id);
@@ -140,4 +145,3 @@ class Webfinger
     }
 }
 
-