Added PHP 7 check in installer and updater.

Till Brehm

2016-04-22 ebd0e986ed11f2a34fb58cdd33efbfab192083ad

 interface/web/dns/form/dns_slave.tform.php

@@ -96,7 +96,7 @@
                                          'errmsg'=> 'origin_error_unique'),
                              */
            1 => array ( 'type' => 'REGEX',
               'regex' => '/^[a-zA-Z0-9\.\-\/]{2,255}\.[a-zA-Z0-9\-]{2,10}[\.]{0,1}$/',
               'regex' => '/^[a-zA-Z0-9\.\-\/]{2,255}\.[a-zA-Z0-9\-]{2,30}[\.]{0,1}$/',
               'errmsg'=> 'origin_error_regex'),
         ),
         'default' => '',