Pg219 Fix gap above the MapView nav bar.
Pg223 Add image picker.
Pg227 Add photo action sheet.
Pg228 Deselect the Add Photo row as the photo action sheet appears.
Pg230 Exercise to replace showImage with didSet Property Observer.
Pg232 Aspect fit the image.
Pg232 Exercise to dynamically set the image height.
Pg234 in heightForRowAtIndexPath replace if-else with switch.