Added initial release of code for stand-alone Deflate library.

README

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+This library is an implementation of Deflate (RFC 1951) decompression,
+with optional support for ZLIB-style (RFC 1950) and gzip-style (RFC
+1952) wrappers of deflate streams.  It currently does not handle
+compression, although this is a natural extension.
+
+The implementation should be portable across all ANSI compliant CL
+implementations, but has been optimized mostly for SBCL and CMU CL
+(and other implementations that can generate fast code for word-sized
+integer calculations based on standard type declarations), and
+somewhat (mostly the otherwise very expensive CRC-32 calculations) for
+Lispworks.  The performance is still a bit off from zlib/gzip (by a
+factor of around 3-3.5 on my systems), and while much of the
+performance loss is likely to be in the stream-based I/O, a less naive
+implementation of the huffman decoding step is also likely to benefit
+performance a bit.
+
+The implementation is licensed under the MIT-style license contained
+in the file COPYING and the header of each source file.
+
+Please direct any feedback to pmai@pmsf.de.  A git repository of this
+library is available under http://github.com/pmai/Deflate/tree/master