Change example to also include video.
Merge remote-tracking branch 'origin/master' into matthias/gallery-videos

Conflicts:
	Examples/PSPDFCatalog/Multimedia/PSCCustomGalleryExample.m
Merge remote-tracking branch 'origin/master' into matthias/gallery-videos
Merge remote-tracking branch 'origin/master' into matthias/gallery-videos
Add sound.
Change caption.
Remove videos from example.
Merge remote-tracking branch 'origin/master' into matthias/gallery-videos
Merge pull request #7 from PSPDFKit/matthias/gallery-videos

Make example work with new gallery API