Amsterdam Hackathon 2014/Topics/Frontend API for image metadata

General plan:
 * Pester tgr to finish his spec for a metadata API on the backend
 * Start working on a frontend mirror system to deal with image metadata, probably as part of the CommonsMetadata extension
 * Document the API in jsduck
 * Write at least one (simple) client to work with the API

Interested attendees:
 * MarkTraceur (WMF) (talk)