add rsd to the list of login actions

Allows rsd.xml to be reached on private sites. Fixes http://status.net/trac/ticket/2309

Conflicts:

	index.php

index.php

@@ -185,7 +185,7 @@ function checkMirror($action_obj, $args)
 
 function isLoginAction($action)
 {
-    static $loginActions =  array('login', 'recoverpassword', 'api', 'doc', 'register', 'publicxrds', 'otp');
+    static $loginActions =  array('login', 'recoverpassword', 'api', 'doc', 'register', 'publicxrds', 'otp', 'rsd');
 
     $login = null;