Jawbone/JBChartView — pull request #103 by ReDetection (2014-08-31 16:40:39+00:00)
Title: Allowed to use negative values (just removed some asserts)

I can confirm that everything looks fine if there no negative values — so this can't break anything in the projects that rely on JBChartView.
On the line graph negative values looks fine and just as expected. Bar chart looks a bit frustrating — because bars grow from the minimum point and not from zero.