NYTPhotosViewController crashes on tapping Share button on iPad

[mpkeefe]

I made a sample app (PRs: #25 #27) in Swift that mimics the current example ObjC app and runs on both iPhone and iPad, using the built-in NYTPhotosViewController. On iPad, the ShareActivityViewController crashes because it needs to be presented inside a popover. This can be done in iOS 8 simply by setting shareActivityViewController.popoverPresentationController?.barButtonItem but on iOS 7 will need to wrap inside a UIPopoverController I guess. Are there any other considerations?

[cdzombak]

The Swift example project is iOS 8-only, I believe, and the Share button works fine on the iPad Simulator.

The ObjC example app currently doesn't seem to work on the iPad at all :/

[heikkihautala]

Created a PR for this: #52.