Snappy: A fast compressor/decompressor

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 Some of the benchmark data in testdata/ is licensed differently:

  - fireworks.jpeg is Copyright 2013 Steinar H. Gunderson, and
    is licensed under the Creative Commons Attribution 3.0 license
    (CC-BY-3.0). See https://creativecommons.org/licenses/by/3.0/
    for more information.

  - kppkn.gtb is taken from the Gaviota chess tablebase set, and
    is licensed under the MIT License. See
    https://sites.google.com/site/gaviotachessengine/Home/endgame-tablebases-1
    for more information.

  - paper-100k.pdf is an excerpt (bytes 92160 to 194560) from the paper
    “Combinatorial Modeling of Chromatin Features Quantitatively Predicts DNA
    Replication Timing in _Drosophila_” by Federico Comoglio and Renato Paro,
    which is licensed under the CC-BY license. See
    http://www.ploscompbiol.org/static/license for more ifnormation.

  - alice29.txt, asyoulik.txt, plrabn12.txt and lcet10.txt are from Project
    Gutenberg. The first three have expired copyrights and are in the public
    domain; the latter does not have expired copyright, but is still in the
    public domain according to the license information
    (http://www.gutenberg.org/ebooks/53).