Move Google fonts to the html to enable parallel downloading.
Fix JSHint warnings.
css/styles.css: Remove duplicate property and overqualified element.
Specify img dimensions in index.md.
Move inline styles to styles.css.
styles.css: Add lines breaks.
Specify the html lang.
Use the protocol relative url for html5shiv.
Specify favicon in the html too.
Fix validation errors.
Include html5shiv.js to the repo to reduce DNS lookups.
Use double quotes consistently.
robots.txt is valid now.
Add normalize.css for better cross-browser support.

Remove the unneeded now selectors from styles.css.