Merge pull request #3312 from yarikoptic/enh-mailmap

Provide mappings for Chrises and Matthew to make "git shortlog -sn" more correct

Author: effigies

.mailmap

@@ -0,0 +1,5 @@
+Chris Gorgolewski <krzysztof.gorgolewski@gmail.com>
+Christopher J. Markiewicz <markiewicz@stanford.edu>
+Christopher J. Markiewicz <markiewicz@stanford.edu> <effigies@gmail.com>
+Matthew Zito <matthewtzito@gmail.com>
+Matthew Zito <matthewtzito@gmail.com> <47864657+MatthewZito@users.noreply.github.com>