Rename; Fallback version

* Rename all code/files to "w3c-h" to make typing easier
* Add fallback version that extends <h1> (closes #14, closes #21)
* Create a demo page for the fallback
* Document the fallback in the README and on the demo pages
* Remove index1 and outline-test (for now, at least)
Merge pull request #22 from matatk/gh-pages

Rename; Fallback version