title: Fix header on vis.js timeline to page
body: <p>It's great the library <a href="https://github.com/almende/vis/issues/152" rel="nofollow">fixes headers now</a> within the chart itself, but for us it's halfway there.</p>
  
  <p>Because it's difficult to customise the headers, I added a purpose built row to include some numbers for the month.
  Large timelines are painful to scroll vertically, so our users prefer large HTML page they can scroll with, however this of course negates the built in fixed headers.
  <img src="https://cloud.githubusercontent.com/assets/1445323/12028409/0e48863a-ae12-11e5-81f0-01d27ee25b4c.png" alt="image"></p>
  
  <p>I've been exploring code to float either the original header or my content on the page, allowing for page scrolling, but my CSS is not that strong. I've used <a href="http://css-tricks.com/persistent-headers/" rel="nofollow">this technique</a> with success for basic reports, but I'm not sure it's suited here regarding the ability to move the timeline sideways</p>
  
  <p>Any pointers, ideas, suggestions?</p>