Release node packages for each version

[blahah]

It seems lens is not on npm. Since it's already set up as a node package, it would be very easy to publish it on npm.

Could you please cut a release on npm? It would be nice to be able to npm install --save rather than adding the git address for a release commit as a dependency.

[blahah]

I went ahead and published 2.0.0-beta5 on npm as elife-lens (lens was taken): https://www.npmjs.com/package/elife-lens

Let me know if you want to take control of this, otherwise I'll just publish new versions when you release them, after ammending the tag commit to use the name elife-lens in package.json.

[michael]

Thanks a lot for this! And sorry I missed responding to the issue.