This directory contains external projects, taken from the following locations:
scrypt: http://www.tarsnap.com/scrypt.html
 - changed: commented out compiler warnings about a workaround for a llvm bug
googletest: https://github.com/google/googletest/tree/release-1.8.0
spdlog: https://github.com/gabime/spdlog/tree/v0.14.0/include/spdlog