by Tomasz Muras.
Eloy is your main suspect but you have 3 more:
% ack-grep optigroup | grep / | cut -d: -f1 | sort | uniq | xargs -n 1 git blame | grep optigroup | cut -d' ' -f2,3 | sort | uniq -c
9 (David Mudrak
121 (Eloy Lafuente
50 (Petr Skoda
3 (sam marshall
Tomek