Add CONTRIBUTORS file.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/CONTRIBUTORS Tue Dec 03 11:47:01 2013 -0800
@@ -0,0 +1,16 @@
+Adam Spiers <adam@spiers.net>
+Alexander Perlis <aperlis@math.lsu.edu>
+Emile "iMil" Heitor <imil@home.imil.net>
+Gertjan Halkes <shelldap@ghalkes.nl>
+Giacomo Tenaglia <Giacomo.Tenaglia@cern.ch>
+Jonathan Rozes <jonathan@laika.com>
+Josef Wells <Josefwells@alumni.utexas.net>
+Landry Breuil <landry@cvs.openbsd.org>
+Michael Granger <ged@faeriemud.org>
+Michael Raitza <spacefrogg-devel@meterriblecrew.net>
+Mike Hix <m@hix.io>
+Peter Marschall <peter@adpm.de>
+Rick H. <rickh_shelldap@printstring.com>
+Rong-En Fan <rafan@FreeBSD.org>
+Salvatore Bonaccorso <carnil@debian.org>
+Yann Cezard <yann.cezard@univ-pau.fr>