*grumble grumble*

On looking at this further, there's not much point in us using glog at all if we're working around most of its features (c.f. codegangsta/cli and this PR).

If the only thing we want is binary logging levels (`debug=off` and `debug=on`), and to always log to stderr, I would rather just rip out glog entirely - it will make things even simpler.