Most of Ch. 10: BNRImageStore can store images. BNRItem's store a key which can be used to get an image from BNRImageStore
Ch. 10: Show an item's image in the UIImageView control. Clear out an item's existing image, before saving a new one to BNRImageStore
Finished Ch. 10
Finished Ch.12,  bronze challenge
Ch. 12, Silver Challenge works: users can remove an image, when it is present. Fixes some UIView layout bugs on iPad 3