title: Using Highcharts.js to create a punch card style graph
body: <p>I'd like to replicate the "punch-card" style graph presented on github via highcharts.</p>
  
  <p><img src="https://i.stack.imgur.com/2vX3Z.png" alt="GitHub Punch Card Graph"></p>
  
  <p>I'm really struggling with this one, here's a <a href="http://jsfiddle.net/CA2cT/1/" rel="nofollow noreferrer">jsfiddle</a> that starts to get me there.  I'd rather have days on the y and time on the x, but I'm at a loss at to how I should go about doing this.</p>
  
  <p>Any help appreciated.</p>
  
  <p>TIA!</p>