Added support to fleece multiple images.

- Added product feature for image_scan. Added button to scan multiple images to Images list view toolbar and changed Image summary screen toolbar to use correct button id.
- Updated count of product features in spec test

https://bugzilla.redhat.com/show_bug.cgi?id=1141353
https://bugzilla.redhat.com/show_bug.cgi?id=1140853

@dclarizio please review/test