Got some permission to use userdiff patterns

I contacted a number of Git authors and lined up their permission
to relicense their work for use in libgit2 and copied over their
code for diff driver xfuncname patterns.  At this point, the code
I've copied is taken verbatim from core Git although Thomas Rast
warned me that the C++ patterns, at least, really need an update.
I've left off patterns where I don't feel like I have permission
at this point until I hear from more authors.

git.git-authors

@@ -39,8 +39,10 @@
 #  but has otherwise not contributed to git.)
 #
 ok	Adam Simpkins <adam@adamsimpkins.net> (http transport)
+ok	Adrian Johnson <ajohnson@redneon.com>
 ok	Andreas Ericsson <ae@op5.se>
 ok	Boyd Lynn Gerber <gerberb@zenez.com>
+ok	Brandon Casey <drafnel@gmail.com>
 ok	Brian Downing <bdowning@lavos.net>
 ok	Brian Gernhardt <benji@silverinsanity.com>
 ok	Christian Couder <chriscool@tuxfamily.org>
@@ -50,11 +52,13 @@ ok	Holger Weiss <holger@zedat.fu-berlin.de>
 ok	Jeff King <peff@peff.net>
 ok	Johannes Schindelin <Johannes.Schindelin@gmx.de>
 ok	Johannes Sixt <j6t@kdbg.org>
+ask	Jonathan Nieder <jrnieder@gmail.com>
 ok	Junio C Hamano <gitster@pobox.com>
 ok	Kristian Høgsberg <krh@redhat.com>
 ok	Linus Torvalds <torvalds@linux-foundation.org>
 ok	Lukas Sandström <lukass@etek.chalmers.se>
 ok	Matthieu Moy <Matthieu.Moy@imag.fr>
+ok	Michael Haggerty <mhagger@alum.mit.edu>
 ign	Mike McCormack <mike@codeweavers.com> (imap-send)
 ok	Nicolas Pitre <nico@fluxnic.net> <nico@cam.org>
 ok	Paolo Bonzini <bonzini@gnu.org>
@@ -68,4 +72,5 @@ ok	Sebastian Schuberth <sschuberth@gmail.com>
 ok	Shawn O. Pearce <spearce@spearce.org>
 ok	Steffen Prohaska <prohaska@zib.de>
 ok	Sven Verdoolaege <skimo@kotnet.org>
+ask	Thomas Rast <tr@thomasrast.ch> (ok before 6-Oct-2013)
 ok	Torsten Bögershausen <tboegi@web.de>