Makes the toolbar height a constant, placing it in GKImageCropView for now (might not be the best place) and #import-ing it where necessary.
Makes style of image cropper more iOS7-ish
Stops taking toolbar height into consideration with cropper, as it is now transparent
Makes the border of the cropper a bit simpler and more explicit
Modifies placement of imageView on scrollView so that there never are empty spaces around the cropped image. Initially places image centered in crop rect. Fixes placement and cropping code by simplifying it.