Animation glitch when PhotosVC is dismissed by calling dismissViewController… on presenting VC

[cdzombak]

This issue was introduced with #121 and #122 allowing programmatic dismissal of NYTPhotosViewController.

When a view controller presents a NYTPhotosViewController, it may wish to dismiss that PhotosVC programmatically.

If the presenting VC calls [self.presentedViewController dismissViewControllerAnimated:completion:], the dismissal animation occurs as expected:

If the presenting VC simply calls [self dismissViewControllerAnimated:completion:], the NYTPhotosViewController is dismissed, but an animation glitch occurs:

[cdzombak]

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