The original repo (https://github.com/ablage/visual-diff-plugin) contains a hpi file which differs from the checked in code.
Rather then use the supplied source code (which when compiled, didn't seem to render correctly) I've extracted the hpi file into a new dev branch and modified it to fix a couple of js & css bugs and better match Wazoku's needs.
Use the make_hpi.sh script to repackage the hpi file which can be uploaded to Jenkins
Install the perceptualdiff package with:
yum install perceptualdiff
Add the path of the binary to the system configuration for the visual-diff plugin, and the plugin should be ready to run.