Alt tags for images

Refinerycms-images will now accept title and alt attributes for images.
If not supplied both will default to the image file name
Title and alt are available in the index views (grid_ and list_ ) on hover over the thumbnail or title respectively.
Where is this file located? It [doesn't appear to exist](https://travis-ci.org/refinery/refinerycms/jobs/33145487#L270)!