Add mailmap for better "git shortlog -nse"

ctrueden · ctrueden · commit e9e5eb593a8c · 2016-06-09T15:50:07.000-05:00
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1 @@
+Mark Hiner <hiner@wisc.edu> <hinerm@gmail.com>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Mark Hiner <[email protected]> <[email protected]>`