title: Highcharts x axis label text wrapping lost on setting label step
body: <p>I have a problem with the Highcharts label wrapping on the X axis .It is lost on setting the 
  label step property as shown in the links below</p>
  
  <p>Correct: <a href="http://jsfiddle.net/Bimal/45Lp3/" rel="nofollow">http://jsfiddle.net/Bimal/45Lp3/</a></p>
  
  <p>Incorrect: <a href="http://jsfiddle.net/ahwmv/" rel="nofollow">http://jsfiddle.net/ahwmv/</a></p>
  
  <pre><code> $(function () {
  $('#container').highcharts({
  
      chart: {
      },
  
      xAxis: {
          categories: ['Apple Orange: PineApple Mango Grapes (% of Sales)', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
          labels: {
              step: 1
          }
      },
  
      series: [{
          data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]        
      }]
  });
  </code></pre>
  
  <p>});</p>
  
  <p>When xAxis.labels.step is set to its default null value ,the text wrapping is done .
  Please suggest a way to maintain the wrapping when the labels step is given a numeric value.</p>
  
  <p>Thanks</p>