Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  ae50fad5f57d4dfe1ede8fe37fa14fb40034d2b6

Use promises

Uses promises in the entirety of fetchImageInfo. Also removes the old
fetchRepoInfo method which was unused (basically) anyway.

Change-Id: Ie7f9a27822ecb893b99dbd755c6199769f2e6784