title: Integrate keen.io json to highcharts js
body: <p>Anyone can help me to represent this kind of json data into highcharts time series chart. The confusing part is the timeframe I got from this json</p>
  
  <pre><code>[
    {
      "value": {
        "registered_user": 12,
        "inactive_user": 5,
        "active_user": 7
      },
      "timeframe": {
        "start": "2016-06-01T00:00:00.000Z",
        "end": "2016-07-01T00:00:00.000Z"
      }
    },
    {
      "value": {
        "registered_user": 30,
        "inactive_user": 10,
        "active_user": 20
      },
      "timeframe": {
        "start": "2016-07-01T00:00:00.000Z",
        "end": "2016-08-01T00:00:00.000Z"
      }
    },
    {
      "value": {
        "registered_user": 25,
        "inactive_user": 8,
        "active_user": 17
      },
      "timeframe": {
        "start": "2016-08-01T00:00:00.000Z",
        "end": "2016-08-30T00:00:00.000Z"
      }
    }
  ]
  </code></pre>