Remove calls to login/token.php just to check if site exists

This issue should be tested both in Android and iOS. Install the app and try to access a site using https (valid certificate). Check that everything is ok. Try to access a site using http. Check that everything is ok. In a site as admin, disable WebServices (e.g. in Site administration > Mobile app > Mobile settings > enablemobilewebservice). Try to access the site you just disabled. Check that you see an error saying that WebServices are disabled. Try to access a 3.0 site. Check that you see an error saying that the app only supports 3.5 sites or newer.