Improve command line argument parsing

[bjornstar]

Fixes #258

node has particular CLI usage patterns that are not supported by minimist. specifically, --inspect which has either no option or must include =.

I've added specific support for inspect & r / require. Unknown argument should be passed on to node.

We now throw if we cannot identify the script portion of the command line arguments. In the future we can instead list the command line arguments when this happens.

The way this now works is we manually handle the inspect options and remove them before passing the args off to minimist. We parse once with minimist to determine the location of the script and then parse again with the default values that we find in that script's directory.

I'll release this with a major version bump as I'm not 100% certain I covered all the use cases out there.