Add a _config.yml to exclude unneeded files/folders from being parsed by Jekyll.
Update .gitignore.
Clean up .jshintrc.
Update README.md.

* add dependencies badge
* use the new .io URL
* simplify code syntax
html: switch to simple doctype and use the concatenated JS dist file.
Use QUnit from OSSCDN.
htmlparser.js: Make the license header comment important.