Kasper Nilsson decbe5fd74 Add plugin endpoint for image diffs
Adds a <gr-endpoint-decorator> in an image diff. The existing
side-by-side image diff format will remain (at least for now), and the
diff of the images will be shown centered between and below them. This
is done to not disrupt the existing table formatting.

Change-Id: Id6453ea1ee2897393b5acdb6f0cd2168892d33ab
2018-05-29 13:51:46 -07:00
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