Merge pull request #11 from matatk/gh-pages

README code blocks and structure
Merge pull request #13 from matatk/gh-pages

Use git submodules for Polymer
Merge pull request #17 from matatk/gh-pages

Level attribute and CSS refactor
Merge pull request #18 from matatk/gh-pages

Update README to reflect latest code behaviour
Merge pull request #19 from matatk/gh-pages

Minor README clarifications on styling
added another example with empty section
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)