Add Florian Forster to hall of fame

Permission recieved from Florian Forster on Jan 07 2013 to include
any changes of his from core Git into LibGit2.

AUTHORS

@@ -20,6 +20,7 @@ Dmitry Kakurin
 Dmitry Kovega
 Emeric Fermas
 Emmanuel Rodriguez
+Florian Forster
 Holger Weiss
 Ingmar Vanhassel
 J. David Ibáñez

git.git-authors

@@ -44,6 +44,7 @@ ok	Boyd Lynn Gerber <gerberb@zenez.com>
 ok	Brian Gernhardt <benji@silverinsanity.com>
 ok	Christian Couder <chriscool@tuxfamily.org>
 ok	Daniel Barkalow <barkalow@iabervon.org>
+ok	Florian Forster <octo@verplant.org>
 ok	Holger Weiss <holger@zedat.fu-berlin.de>
 ok	Jeff King <peff@peff.net>
 ok	Johannes Schindelin <Johannes.Schindelin@gmx.de>