title: Loading external json file in highchart
body: <p>When loading external JSON file in HighCharts it shows nothing in the browser. I have following JSON data. I have included highchart.js and jquery.js in the <code>head</code> of my HTML code, but still I cannot get a bar chart in my browser. No error is shown in console when checking the console. </p>
  
  <pre><code>var json = [{
      "key": "Apples",
      "value": "4"
  }, {
      "key": "Pears",
      "value": "7"
  }, {
      "key": "Bananas",
      "value": "9"
  }];
  
  var processed_json = new Array();
  $.map(json, function(obj, i) {
      processed_json.push([obj.key, parseInt(obj.value)]);
  });
  
  $('#container').highcharts({
      chart: {
          type: 'column'
      },
      xAxis: {
          type: "category"
      },
      series: [{
          data: processed_json
      }]
  });
  </code></pre>