Upgrade to Jade 1.0.0, to make dox-foundation usable again

Dox-foundation as on NPM is currently unusable, as Jade's API has changed and there's no specific version specified here (see #48).

@acornejo's fix in #49 does solve that neatly as a short-term fix, but I'd much prefer it personally if dox-foundation just updated to the latest Jade release (1.0.0) properly, to make so this PR goes further and does that instead.

Essentially it's just an API change from `doctype 5` -> `doctype html`, and explicit wrapping of each `include` with the relevant tags to have it interpreted properly.