add bsd-alike pngnq license

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+Copyright (c) 2004-2007 Stuart Coyle  
+
+Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+
+This software is provided "as is," without warranty of any kind,
+express or implied.  In no event shall the author or contributors
+be held liable for any damages arising in any way from the use of
+this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute
+it freely, subject to the following restrictions:
+
+1. Redistributions of source code must retain the above copyright
+   notice, disclaimer, and this list of conditions.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, disclaimer, and this list of conditions in the documenta-
+   tion and/or other materials provided with the distribution.
+3. All advertising materials mentioning features or use of this
+   software must display the following acknowledgment:
+
+      This product includes software developed by Greg Roelofs
+      and contributors for the book, "PNG: The Definitive Guide,"
+      published by O'Reilly and Associates.
+
+---------------------------------------------------------------------------
+
+	NeuQuant Neural-Net Quantization Algorithm
+
+	 Copyright (c) 1994 Anthony Dekker
+
+NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994.
+See "Kohonen neural networks for optimal colour quantization"
+in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367.
+for a discussion of the algorithm.
+See also  http://members.ozemail.com.au/~dekker/NEUQUANT.HTML
+
+Any party obtaining a copy of these files from the author, directly or
+indirectly, is granted, free of charge, a full and unrestricted irrevocable,
+world-wide, paid up, royalty-free, nonexclusive right and license to deal
+in this software and documentation files (the "Software"), including without
+limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons who receive
+copies from any such party to do so, with the only requirement being
+that this copyright notice remain intact.