Merge pull request #9 from LucasJones/master

CryptoNight support
Merge pull request #13 from LucasJones/master

Fix compiler error
Update NPM version
Merge pull request #14 from LucasJones/master

cn_fast_hash support
Merge pull request #15 from LucasJones/master

Cryptonight optimizations
Initial x13 support