title: Not able to draw vertical event lines for morris chart
body: <p>I'm trying to include event lines in the Morris line chart. The event lines appear for integer values in the X axis but not for time values. It just draws an event line for '00:00:00' when event values are passed and <code>parseTime</code> parameter is set to true and nothing appears when <code>parseTime</code> is set to <code>false</code>. So basically, how can I draw events for time values on the X axis ?  </p>
  
  <pre><code>var morrisLineData = [{y: "11:16:02", a: 17.73},
                  {y: "11:16:53", a: 39.43},
                  {y: "11:16:58", a: 5.02},
                  {y: "11:17:07", a: 17.73}];
  var morrisLine = Morris.Line({ 
      resize: true,
      element: 'morrisLine',
      data: morrisLineData,
      xkey: 'y',
      ykeys: 'a',
      labels: ['value1'],
      xLabelAngle: 45, 
      gridTextSize: 12,  
      parseTime: true, 
      hideHover: true,
      lineColors: ['#0088cc'], 
      events: ['11:16:58'],
      eventLineColors: 'black'
  });
  morrisLine.setData(morrisLineData);
  </code></pre>