Add CONTRIB file and mkcontrib.sh

Signed-off-by: Hector Martin <hector@marcansoft.com>

CONTRIB

@@ -0,0 +1,10 @@
+For a list of libfreenect authors, please see the Git history of the project,
+such as with 'git log'. This file will contain a list of authors on release
+snapshots of libfreenect.
+
+THIS FILE IS NOT VALID FOR NON-GIT DISTRIBUTIONS. If you wish to redistribute
+libfreenect source code outside of the Git infrastructure, you MUST either use
+a release version or generate a complete CONTRIB file valid for the source Git
+revision tree that you use for your distribution. Redistributions of libfreenect
+source code without a valid CONTRIB file and without Git metadata are not
+compliant with the license.

mkcontrib.sh

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+#!/bin/sh
+
+echo "The following people have contributed to libfreenect:" > CONTRIB
+echo >> CONTRIB
+
+# note: some exclusions to clean up botched git author tags that got fixed in
+# later commits, hopefully we'll be more careful about this in the future
+git log --format='%aN <%aE>' | sort | uniq | grep -E -v \
+	'brandyn@router|sl203|mwise@bvo|richmattes|kai.*none' | sort >> CONTRIB