Missing X-Label


![screen shot 2018-01-01 at 4 40 43 pm](https://user-images.githubusercontent.com/11250498/34472272-e4729a8c-ef12-11e7-9d2c-eadd4a68b302.png)

Missing x-label as shown.

My data set looks like: 
data = [
[{'hours': 2, 'day': 1}],
[{'hours': 4, 'day: 2}],
....
]

And showLabel is set true.
axisX: {
        showLabels: true,
}