Added color and a threshold distance for adding lines. Also added `initWithFrame` method.
Remove ChartPointView from storyboard; we’ll add it programmatically
Just added code to (a) create random sets of chart points; and (b) have `viewDidLoad` create three views, of which only the first is visible, but then animates `transform` and `alpha` to show second one and remove it; and (c) likewise animate third one’s alpha (and make it red).