title: javascript rickshaw graph auto scale
body: <p>I am plotting with rickshaw graph,  in the y-axis, I need to scale it properly.</p>
  
  <p>I could do something like this:</p>
  
  <pre><code>var graph = new Rickshaw.Graph( {
    element: document.getElementById("chart"),
    renderer: 'multi',
    min:165000000,
    max:176000000,
    width: 1000,
    height: 500,
    ....
  </code></pre>
  
  <p>but I hope it can automatically scale in the y-axis,  instead of hard code "min" and "max" here.  anyone has a simple example for this?  Thanks</p>