Split out JWS implementation

[emosenkis]

I'm thinking of trying to implement the ACME protocol (e.g. LetsEncrypt), which requires JWS. Would you consider splitting that part of the functionality into a separate library or at least making the appropriate parts public?

[Keats]

I don't want to split the package, can you do a PR making what you need public?

[Keats]

@emosenkis ping

[emosenkis]

This is for a side project, so I may not get to it for a long time. If and when I get to it, I'll send you a pull request. Feel free to close this issue if you prefer.