Test stubs

Hi folks,

As part of my current work for on Service Workers for Mozilla, I've been
working on a small program that auto-generates test stubs directly from
specs. It also produces near complete idlharness test pages for all IDL
blocks it encounters.

I've used it to generate test stubs for the Service Workers specs[1].

This is still pretty much a work in progress atm.

I have a couple of additions planned in the near future (like sync with
github issues, CLI, handling spec changes, etc.) and a bunch of clean-up to
do before I open-source it.

Thoughts and feedback welcomed.

Best,

--tobie

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[1]: https://github.com/w3c/web-platform-tests/pull/1053