Add a .mailmap
Add a .mailmap

For 'git shortlog -n -s' goodness...

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

kephale/imagej-ops,stelfrich/imagej-ops,gab1one/imagej-ops,imagej/imagej-ops