Update with latest upstream code

[stereokai]

Hi @Ericbla, I forked your binary-parser-encoder fork and updated it by cherry picking all the commits from the original project that were missing here. I also got all current tests passing both for the parser and the encoder.

I'll be happy to commit for a little while to ensure your encoder project gets merged into binary-parser. As the original developer, your input and help in understanding your original motives and challenges would make a huge difference, so please let me know if you'd like to collaborate on this again :)

CC @keichi

[Kreijstal]

@stereokai Thank you so much, thank you!