use a customizable nonce generator function

[gmelika]

this allows for the module to be used in projects where the same api key is shared among different processes

[gferrin]

Hi gmelika, Thanks for the pull request. I like the idea but I don't like the default nonce generator you replaced mine with. If you set it back to the function that sets it with the date initially and then returns ++nonce I'll be happy to merge your request.

[gmelika]

Fair enough. I've changed the pull request accordingly

[gferrin]

Cool, thanks. I'll add to npm soon.

[gmelika]

thank you.