title: Tree drawing orientation
body: <p>I've made a slightly modified tree using the tree layout. I needed to orient the tree right-to-left instead of the regular left-to-right orientation that's the default. What is the right and proper d3:ish way to do this?</p>
  
  <p>I ended up doing this by simply inverting the x coordinate after creating the layout but I feel that this is a hack. Surely there is something more elegant?</p>
  
  <p>I thought about doing an SVG rotation around the center but then I'd have to rotate the labels to get the text right way around. That didn't feel right either.</p>