Display continuous feed of recent photos with metadata

[rencevio]

Nice-to-haves/concerns:

• All photos are fetched with the fixed size (800px-longest for preview and 1024px-longest for the full size) regardless of the user's screen size
• When switching to the landscape orientation on iPad, some constraint errors are logged, though the app is rendered correctly
• For the full image view, the large size (1024px-longest) of the photo is displayed. That might not be the original size, but any size beyond the large required user authentication
• When image data for a collection of photos is requested, only photos with successfully fetched data are returned; the rest are ignored. This is not an ideal error handling but is suitable for the MVP
• It is not possible to show the load progress of a full-size photo download, as Flickr API does not provide the Content-Length header
• Scroll animation when the user has scrolled down to the bottom of the feed is a little bit wonky sometimes