Run as superuser where appropriate, and fix up an example.

Pull request #25 introduced pulling the repositories as a normal user
and using sudo to esclate when necessary. This commit fixes broken
examples by adding sudo to the commands that will not work with limited
privileges. This commit also adds ./ to an example where needed.
Merge pull request #42 from rhy-jot/master

Run as superuser where appropriate, and fix up an example