Publish crates to crates.io

[drskalman]

We want to publish common and ring but we need a better name for them. It was suggested that common be renamed to w3f-plonk-common. and ring should also probably rename to something like ring-proof.

[davxy]

To publish these you first need to publish fflonk I guess

But please, let's first address #36

In JAM we're also using a feature from my fork to produce test-vectors. If we switch to crates.io we need it there as well. I'll propose a PR after #36 is merged

[drskalman]

I started this meanwhile, till we settle remaining issues.

[shawntabrizi]

Hey! I am representing the proof of personhood team for parity/polkadot and would like to note that recently our stuff is broken because of updates from the github repos.

publishing the crates would probably solve this, allowing us to keep our projects working against a specific version

[swasilyev]

A part of #36 went to #44 and #45. I didn't merge anything test-vectors related though.

[shawntabrizi]

@swasilyev how to get in contact with you? right now https://github.com/w3f/ring-vrf
is broken, because you recently bumped all the ark-xx crates from 0.4 to 0.5 or something.

We need versioning, crate publishing, and @swasilyev if you can fix things asap in their current state, that would be very helpful.

cc @georgepisaltu