detect the ubuntu version based on /etc/os-release

Uwe Merbeth

2016-05-09 f5daecadf5846ff0b2d512e6a1a47f17342fe02b

 interface/lib/classes/aps_crawler.inc.php

@@ -460,6 +460,7 @@
               }
            }
            //var_dump($apps);
            //echo print_r($apps_to_dl).'<br>-------------------<br>';

            // For memory reasons, unset the current vendor and his apps
            unset($apps);