Run the nodeunit tests as part of the Build target.

https://jira.int.corefiling.com/browse/DECIMATE-2857
Improve the performance of charts by pruning data in a way that
preserves the chart's shape.

The chart data is split into equal time segments (the number of which is
determined by the steps option on Graph.Renderer, default: 500).

The data is pruned so a maximum of 4 points are chosen as
representatives of each segment:
* Two points to set the correct range (max/min y-values)
* Two points so lines entering/exiting the segment are correct

https://jira.int.corefiling.com/browse/DECIMATE-2857