1.5.1
Changes for 1.5.1:
Added the Kanban Board sample, derived from the Swim Lanes (vertical) sample.
Fixed scrollbar clicking on touch-enabled devices in Chrome on Windows.
More graceful handling of Picture1 image errors.
Fixed bugs with undo of changed state inside Parts whose Part.category was later changed.
Stopped touch events from always calling preventDefault (touch events were impossible to bubble).