Use HTTPS clone URL

Some of the POs had to change the clone URL to get the vagrant box to provision properly on Windows. If the behaviour is the same could we switch to the HTTPS URL for everyone so that it "just works" regardless of OS?

If there is a good reason that the SSH URL is preferred then maybe we just have the HTTPS URL in the VagrantFile but commented-out so it is easy for Windows users to switch it over.