title: X Axis label angle in dateAxisRenderer
body: <p>I am not able to find the tickOption for dateAxisRenderer.</p>
  
  <p>I've tried it in the following way:</p>
  
  <pre><code>axes:{
  axesDefaults:{tickRenderer : $.jqplot.CanvasAxisTickRenderer, tickOptions :{angle: -30}},
  xaxis:{
  renderer: $.jqplot.DateAxisRenderer,
  tickOptions:{
  angle: -30,
  formatString:'%H:%M'
  },
  }
  }
  </code></pre>
  
  <p>but this din't seem to work. Can someone please help me with this.</p>