Display gravatar's of broken build claimants

[keirlawson]

This gives an easy way to quickly visually identify who is looking at a particular build. If this is considered desirable I may be able to submit a PR to implement.

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[dimkin-eu]

+1 to this :) "No blame game" gets to new level :D

[janfaracik]

Took a short while but this is now available in https://github.com/jenkinsci/build-monitor-plugin/releases/tag/995.v05626a_849c6c :) (#1108)