First thanks for grav. It seems really well done and with a good future. I’m testing it on my local machine. Any time I try to run gpm install I got something like:
Error while trying to download ‘https://github.com/getgrav/grav-theme-mediator/zipball/1.0.1’
and the same happens with any other theme. For the moment I have solved this by using the shop skeleton for my tests, but when I use one-page skeleton I get and empty page, so I think that proper themes installation is the way to go for customization.