Add support for quoted args

[vagos]

This has worked in my limited experimentation.
Solution might not be perfect, but might be a good starting point for someone to finish it off.

[mgree]

This is something that is only hard because of the shell's craziness. And it's really, really hard to get right.

I don't think it's possible portably with this approach, though. If we want to try to do this, the best thing is to write each arg to its own file and generate appropriate $(cat argN) invocations... but even this will combine multiple trailing newlines.

Figured out the right approach in the car. We should thread args into both scripts using "$@". Is it okay if I push to this branch, @vagos?

[vagos]

@mgree Yeah, feel free to!