feel free to have a look @rubemlrm - if you like it, approve it
(but you can also merge it, if you want to)

@joergi with this approach user it will download everything? Looks that user looses the option to set a limit from the shell script call.

@rubemlrm no the magpi-issue-downloader.sh works as before.
You never call the generic downloader.
The project will work, as before.
It's just, that we don't need the same script in every project (magpi/helloworld/wireframe/hackspace)
The tests with the limits are still working