Search fields

[liamwhite]

Adds five new search fields:

• animated: is the image supposed to be animated? (regardless of reported duration)
• processed: has the image been fully processed and optimized?
• thumbnails_generated: does the image have thumbnails?
• frames: to be populated at a later date
• fps: to be populated at a later date (frames/duration for nonzero durations, average FPS)

Fixes one:

• duration: clipped to 0 if the image is not supposed to be animated

Deployment steps:

1. Take site down
2. Deploy as usual
3. Run this in the console

   Philomena.Elasticsearch.update_mapping!(Philomena.Images.Image)

4. Bring back online
5. Online reindex of all images