SingleNumberMetricWidget is missing graph option properties

[kennyjwilli]

When creating a awsx.cloudwatch.SingleNumberMetricWidget, one should be able to specify the "Graph options", as seen in the CloudWatch console.

This is especially necessary for SingleNumberMetricWidget since you will often want to show a statistic over the whole selected time period, not just the most recent period.

Selecting "Time range value" in the above screenshot attaches "setPeriodToTimeRange": true to the JSON source for the widget. SingleNumberMetricWidget should add support for this property.

Relevant SO