AUTHORS.md: update list of contributors

Also link to better statistics and add a small appreciation.

AUTHORS.md

@@ -1,7 +1,10 @@
 Authors
 =======
 
-Also see https://github.com/magit/magit/graphs/contributors.
+May (the history of) the source be with you!
+
+For statistics see http://magit.vc/stats/authors.html.
+
 Names below are sorted alphabetically.
 
 Author
@@ -35,6 +38,7 @@ Contributors
 - Ævar Arnfjörð Bjarmason <avarab@gmail.com>
 - Alan Falloon <alan.falloon@gmail.com>
 - Alexey Voinov <alexey.v.voinov@gmail.com>
+- Alex Kost <alezost@gmail.com>
 - Alex Ott <alexott@gmail.com>
 - Andreas Fuchs <asf@boinkor.net>
 - Andreas Liljeqvist <andreas.liljeqvist@robacks.se>
@@ -93,6 +97,7 @@ Contributors
 - Jeff Bellegarde <jbellegarde@whitepages.com>
 - Jeff Dairiki <dairiki@dairiki.org>
 - Jesse Alama <jesse.alama@gmail.com>
+- John Mastro <john.b.mastro@gmail.com>
 - John Wiegley <johnw@newartisans.com>
 - Jonas Bernoulli <jonas@bernoul.li>
 - Jonathan Roes <jroes@jroes.net>
@@ -178,6 +183,7 @@ Contributors
 - Steven Thomas <sthomas314@gmail.com>
 - Steve Purcell <steve@sanityinc.com>
 - Suhail Shergill <suhailshergill@gmail.com>
+- Syohei YOSHIDA <syohex@gmail.com>
 - Takafumi Arakaki <aka.tkf@gmail.com>
 - Teemu Likonen <tlikonen@iki.fi>
 - Teruki Shigitani <teruki.shigitani@gmail.com>

Makefile

@@ -191,12 +191,13 @@ Documentation/dir: Documentation/magit.info
 	@printf "Generating magit.info\n"
 	@$(MAKEINFO) $< -o $@
 
-CONTRIBUTORS_URL = https://github.com/magit/magit/graphs/contributors
+AUTHORS_URL = http://magit.vc/stats/authors.html
 define AUTHORS_HEADER
 Authors
 =======
 
-Also see $(CONTRIBUTORS_URL).
+For statistics see $(AUTHORS_URL).
+
 Names below are sorted alphabetically.
 
 Author
@@ -224,6 +225,7 @@ Contributors
 endef
 export AUTHORS_HEADER
 
+authors: AUTHORS.md
 AUTHORS.md: .mailmap
 	@printf "Generating AUTHORS.md..."
 	@test -d .git \
@@ -232,8 +234,6 @@ AUTHORS.md: .mailmap
 			&& printf "done\n" ; ) \
 		|| printf "FAILED (non-fatal)\n"
 
-authors: AUTHORS.md
-
 install: install-lisp install-docs
 
 install-lisp: lisp