Update release information files.
* Combined AUTHORS and CONTRIBUTORS.
* Added some more folks to the AUTHORS file based on commit history.
* Added Makefile recipe to dynamically generate ChangeLog from last annotated tag or a specified ref.
* Added ignores for tarballs and ChangeLog.
Andreas Köhler <andi5.py@gmx.net>
Colin Walters
Dafydd Harries <dafydd.harries@collabora.co.uk>
Frank Zschockelt <lm@freakysoft.de>
Frederic Crozat
Frederic Peters <fpeters@0d.be>
Jayson Vantuyl <jvantuyl@engineyard.com>
Jelmer Vernooij <jelmer@samba.org>
Josh Beam
Kirk Haines <khaines@engineyard.com>
Leonid Evdokimov <leon@darkk.net.ru>
Martyn Russell <martyn@imendio.com>
Mikael Hallendal <micke@imendio.com>
Owen Taylor <otaylor@redhat.com>
Richard Hult <richard@imendio.com>
Ross Burton
Samuel Tesla <stesla@engineyard.com>
Senko Rasic <senko.rasic@collabora.co.uk>
Sjoerd Simons
Tim Robbins
Tollef Fog Heen
Will Thompson <will.thompson@collabora.co.uk>