Added:
- Enable Resize Crop Area:  A flag indicating whether or not the crop area can be resized. If set to 'NO', the crop area's gesture recognizers are ignored.
- Show Grid: A flag indicating whether or not to show the grid. Note that the grid will always be displayed when the image is being rotated.
- Overlay Alpha: Manually set the alpha (e.g. opacity) of the dark background view.
- Crop Frame Image: Manually set the (resizable) image used to render the crop frame.