StatusNet class renamed GNUsocial

also added backward compatible StatusNet class for the two calls I know
third party plugins use, isHTTPS and getActivePlugins

plugins/OStatus/lib/salmonaction.php

@@ -37,7 +37,7 @@ class SalmonAction extends Action
 
     protected function prepare(array $args=array())
     {
-        StatusNet::setApi(true); // Send smaller error pages
+        GNUsocial::setApi(true); // Send smaller error pages
 
         parent::prepare($args);