Add AUTHORS and AUTHORS generator script

.mailmap

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+Antonis Kalipetis <akalipetis@sourcelair.com>
+Antonis Kalipetis <akalipetis@sourcelair.com> <akalipetis@gmail.com>
+Daniel Imms <daimms@microsoft.com> <tyriar@tyriar.com>
+Paris Kasidiaris <paris@sourcelair.com>
+Paris Kasidiaris <pariskasidiaris@gmail.com>
+Thanasis Daglis <thanasis@sourcelair.com>
+Thanasis Daglis <thanasis@sourcelair.com> <ath.daglis@gmail.com>

AUTHORS

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+List of xterm.js contributors. Updated before every release.
+
+Alexander Olsson <noseglid@gmail.com>
+Antonis Kalipetis <akalipetis@sourcelair.com>
+Austin Robertson <austinrobertson@gmail.com>
+Benjamin Fischer <benjamin.fischer@rwth-aachen.de>
+Carson Anderson <carson@betterservers.com>
+Christopher Jeffrey <chjjeffrey@gmail.com>
+Daniel Imms <daimms@microsoft.com>
+Daniel Risacher <drisacher@gmail.com>
+Dan Kaplun <dbkaplun@twitch.tv>
+Darin Morrison <freebroccolo@users.noreply.github.com>
+Jean Bruenn <himself@jeanbruenn.info>
+Jörg Breitbart <jerch@rockborn.de>
+Paris Kasidiaris <pariskasidiaris@gmail.com>
+Paris Kasidiaris <paris@sourcelair.com>
+runarberg <runar@greenqloud.com>
+Steven Silvester <steven.silvester@ieee.org>
+Thanasis Daglis <thanasis@sourcelair.com>

bin/generate-authors

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+#! /usr/bin/env sh
+
+tail --lines=+3 AUTHORS > AUTHORS.tmp
+git log --format='%aN <%aE>' >> AUTHORS.tmp
+echo "List of xterm.js contributors. Updated before every release.\n" > AUTHORS
+sort -u AUTHORS.tmp >> AUTHORS
+rm -f AUTHORS.tmp