Use GitHub API to retrieve the release download url

[pcortellezzi]

Hello,

This commit resolv #15 and #13 by using download url from json api.

[DiouxX]

Hi,

Your pull request is functionnal to download GLPI source and it's more pratical.

But your modification to test if folder GLPI is empty isn't functionnal. I've checked your command on a little test scenario.

Test this script :

#!/bin/bash

if [ -d /tmp/test ]
then
        echo "Folder is empty"
else
        echo "Folder isn't empty"
fi

And you will see that isn't OK.

Maybe make an another commit about only download GLPI source

[pcortellezzi]

Hello,

Yes sorry i made a mistake and misunderstand the purpose of this test :)

[DiouxX]

it's merged

Thanks for your contribution :)