Update AUTHORS, automate process

Extract pre-git authors to AUTHORS.old and generate the final AUTHORS
file by running generate_authors.sh, which merges AUTHORS.old with
information from the git history.

.mailmap

@@ -0,0 +1 @@
+Dominik Honnef <[email protected]> <[email protected]>

AUTHORS

@@ -4,8 +4,9 @@ Austin Clements <[email protected]>
 Ben Fried <[email protected]>
 Bobby Powers <[email protected]>
 Charles Lee <[email protected]>
-Dominik Honnef <[email protected]>
+Dominik Honnef <[email protected]>
 Eric Eisner <[email protected]>
+Erin Keenan <[email protected]>
 Evan Martin <[email protected]>
 Felix Lange <[email protected]>
 Florian Weimer <[email protected]>
@@ -16,6 +17,8 @@ Jan Newmarch <[email protected]>
 Jean-Marc Eurin <[email protected]>
 Juergen Hoetzel <[email protected]>
 Kevin Ballard <[email protected]>
+Lowe Thiderman <[email protected]>
+Mark Petrovic <[email protected]>
 Mats Lidell <[email protected]>
 Peter Kleiweg <[email protected]>
 Quan Yong Zhai <[email protected]>

AUTHORS.old

@@ -0,0 +1,31 @@
+# This file contains all the authors that contributed to go-mode while
+# it was still part of the Go distribution. Most of these authors are
+# not tracked in this repository's history. For a complete list of
+# authors, see the AUTHORS file instead.
+
+Aaron France <[email protected]>
+Alan Donovan <[email protected]>
+Austin Clements <[email protected]>
+Ben Fried <[email protected]>
+Bobby Powers <[email protected]>
+Charles Lee <[email protected]>
+Dominik Honnef <[email protected]>
+Eric Eisner <[email protected]>
+Evan Martin <[email protected]>
+Florian Weimer <[email protected]>
+Istvan Marko <[email protected]>
+James Aguilar <[email protected]>
+Jan Newmarch <[email protected]>
+Jean-Marc Eurin <[email protected]>
+Kevin Ballard <[email protected]>
+Mats Lidell <[email protected]>
+Peter Kleiweg <[email protected]>
+Quan Yong Zhai <[email protected]>
+Robert Zaremba <[email protected]>
+Rui Ueyama <[email protected]>
+Russ Cox <[email protected]>
+Ryan Barrett <[email protected]>
+Sameer Ajmani <[email protected]>
+Scott Lawrence <[email protected]>
+Steven Elliot Harris <[email protected]>
+Yasuyuki Oka <[email protected]>

generate_authors.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+export LC_ALL=C
+(
+    grep -v "^#" AUTHORS.old | grep -v '^$'
+    git log --format='%aN <%aE>'
+) | sort -u