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Added a new type of label anchored to plot points.
The text and visibility are configured with two new methods in
ScrollableGraphViewDataSource
:plotLabel(shouldShowPlotLabel plot: Plot, atIndex pointIndex: Int)
plotLabel(forPlot plot: Plot, atIndex pointIndex: Int) -> String?
Label style and position is configured with three new properties on
Plot
:labelFont: UIFont
labelColor: UIColor
labelVerticalOffset: CGFloat
Example:
![screen shot 2018-07-14 at 13 56 41](https://user-images.githubusercontent.com/1109819/42724674-a5ef22e0-876e-11e8-8cf8-b6e71a4aed35.png)