Add the ability to retrieve artefacts from password protected public http servers

[joehakimrahme]

Some tools like download.sh or inception.sh need to download artefacts from public servers, some of which can be password protected.

It would be nice to have the ability to configure these tools to be able to give usernames and passwords to the wget calls.

[EmilienM]

discussed IRL about it, we can use auth directly in the URL.

[joehakimrahme]

For the record, if anybody ever reads this, here's how to format your URL for it:

http://user:password@host:port