Fix --cpus and --jobs

This patch fixes two problems:

1. Apparently the docopt spec wasn't written correctly, I needed to add a
   metavar (like N for number) to the spec so that docopt would correctly parse
   the command line args. Without this, I had just been using the default 6 and
   10 that I hardcoded.

2. I never added the --max-jobs and --cores flags to NixBuild, so anytime I
   built a nix target, i.e. any of my NixOS images, it would use all of the
   available cores. I think this is part of why I struggled so much to build
   webkitgtk: I *thought* I was limiting the resources to prevent an OOM crash,
   but I wasn't.

With this fix, I can comfortably limit resources for a build, so I can continue
working while building something in the background.

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