Trivial inline-docs fixes.
Added pseudo-output to <body> when $VIEWPORTS_DEBUG: true; displaying current viewport size.

Docs to follow.
Fixed a typo in the examples, whoops.
Improved the demo page introductions a bit.
Added an example of the $VIEWPORTS_DEBUG: true; generated content.
Added an npm run -target for updating gh-pages.
Updated the docs accordingly.
Updated package.json to mark release.