Written as part of open-contracting/standard_profile_template#33
curl -O https://gist.githubusercontent.com/jpmckinney/ba38d531e245c175e254ea3bc4218001/raw/bbb015f613ba936b3b42f25c576e833d196e5181/diff-reduce.py
python diff-reduce.py
diff -rq build t | grep Only | sort
diff -ru -x '*.js' -x '.buildinfo' -x '_sources' build t | less