Takes screenshots using Shutterbug 1.5
You can configure Shutterbug with the following properties:
shutterbug.capturestrategy (VIEWPORT, FULL, FULL_SCROLL, VERTICAL_SCROLL, HORIZONTAL_SCROLL)
shutterbug.betweenScrollTimeout – Timeout to wait between each scrolling operation
shutterbug.useDevicePixelRatio – whether or not take into account device pixel ratio