Feldman's Verifiable Secret Sharing Support

[zghodsi]

Hi there, I've added support for Feldman's verifiable SS scheme in a fork of this library here. Would you be interested in incorporating this into the library?

[jqueiroz]

Thank you, @zghodsi! Absolutely!

Could you please create a PR when you have a chance?

I am currently traveling, so it might take me a few days to get to it, but I'll review eventually :)