Upgrade to zmq-prebuilt 2.x

[lgeiger]

We have prebuilt binaries working for Linux, OS X and Windows.
zmq-prebuilt can now be built from source as well to support rebuilding with different electron versions. In other words the fallback works 🎉.

[rgbkrk]

🎉

[rgbkrk]

Of note @n-riesco - @lgeiger has been propagating changes upstream to zeromq-node as well as bringing updates from zeromq.node into zmq-prebuilt. We will continue to follow SemVer.

[n-riesco]

Tested on a 32b-linux machine and the fallback works!

@lgeiger Great work!

Is this or zmq-static ready for Hydrogen?

[rgbkrk]

Since I'm unfamiliar with your process - will this be posted with jmp-prebuilt?

[rgbkrk]

zmq-static is now deprecated since zmq-prebuilt handles it.

Could we rely on zmq-prebuilt in jmp itself since this handles the fallback?

[n-riesco]

@rgbkrk This PR's already published as jmp-prebuilt@0.5.1.

Is zmq-static deprecated because zmq-prebuilt builds the zmq library statically?
Does this mean that we don't need to ask users to install libzmq3-dev?

I'm also guessing from your question about jmp that the work in zmq-prebuilt won't be merged into zmq. Is that it?

[rgbkrk]

Is zmq-static deprecated because zmq-prebuilt builds the zmq library statically?

Yes!

Does this mean that we don't need to ask users to install libzmq3-dev?

This is correct.

I'm also guessing from your question about jmp that the work in zmq-prebuilt won't be merged into zmq. Is that it?

We're going to try to, over time. Right now the process of getting things in, adjusting AppVeyor (and shipped assets), and anything involving settings on the zmq package is a bit of a pain. Within nteract, we have enough control to bring on collaborators with team level permissions and give them the freedom and responsibility to adjust things like AppVeyor + ship releases in automation.

[n-riesco]

I feel a bit queasy about the idea of maintaining zmq-prebuilt outside the zmq community (we really need to get the changes in zmq-prebuilt merged into zmq).

I will release this PR as jmp@0.6.0 to help with testing zmq-prebuilt, but with the proviso that we intend to get zmq-prebuilt into zmq.