Add .mailmap file

.mailmap

+Todd Gamblin       <tgamblin@llnl.gov>          George Todd Gamblin <gamblin2@llnl.gov>
+Adam Moody         <moody20@llnl.gov>           Adam T. Moody       <moody20@llnl.gov>
+Alfredo Gimenez    <gimenez1@llnl.gov>          Alfredo Gimenez     <alfredo.gimenez@gmail.com>
+David Boehme       <boehme3@llnl.gov>           David Boehme        <boehme3@sierra324.llnl.gov>
+David Boehme       <boehme3@llnl.gov>           David Boehme        <boehme3@sierra648.llnl.gov>
+Kevin Brandstatter <kjbrandstatter@gmail.com>   Kevin Brandstatter  <kbrandst@hawk.iit.edu>
+Luc Jaulmes        <luc.jaulmes@bsc.es>         Luc Jaulmes         <jaulmes1@llnl.gov>
+Saravan Pantham    <saravan.pantham@gmail.com>  Saravan Pantham     <pantham1@surface86.llnl.gov
+Tom Scogland       <tscogland@llnl.gov>         Tom Scogland        <scogland1@llnl.gov>
+Tom Scogland       <tscogland@llnl.gov>         Tom Scogland        <tom.scogland@gmail.com>
+Joachim Protze     <protze@rz.rwth-aachen.de>   jprotze             <protze@rz.rwth-aachen.de>