Use <article> and <aside>
Use <time>
Use <small> for the copyright

This follows the new semantic meaning of <small> in HTML 5

Quoting the spec:
> Small print typically features disclaimers, caveats, legal restrictions,
> or copyrights. Small print is also sometimes used for attribution, or
> for satisfying licensing requirements.
Use <header>, <main>, and <footer>
:lipstick:
Merge pull request #44 from cbarrick/html5

Better HTML 5 semantics
Use Jekyll's default markdown parser and highligher

With the current version of Jekyll (2.4.0), this changes the markdown
parser to Kramdown.
Merge pull request #58 from nicolasmccurdy/kramdown-support

Use Jekyll's default Markdown parser and highligher