Tabs/spacing again
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
Styles based on nesting level; Indentation; Examples

* Styles of headings are now based on their aria-level
* Fixed minor indentation error in w3c-headings style
* Synch first heading example with purported code in index.html
Merge branch 'gh-pages' of https://github.com/matatk/w3c-heading into matatk-gh-pages

Conflicts:
	index.html
Merge branch 'matatk-gh-pages' into gh-pages