Add link to header include template
Remove browser styling of anchor tags for header link
Remove gray background color for anchor tags in IE - see https://github.com/necolas/normalize.css/commit/37b483c1e1f0a11f3734c86410d051a31378a512
Merge pull request #6 from matiassingers/header-link

Linkify "Intro to D3.js" header