Add ChaCha20#31

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david415 wants to merge 14 commits intotahoe-lafs:masterfrom

david415:94.add_chacha20.3

Commits on Aug 3, 2016

Add latest version of crypto++ from git commit id d1188ef7e79593b226c1fd4197060bd1fdaa8f17
david415
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Add reference and declaration of cryptopp_extra_version to fix build for pycryptopp
david415
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Commits on Aug 11, 2016

Commits on Aug 12, 2016