Workmen - a real backend

This is the first step to migrate to the new [workmen](https://github.com/biojs/registry-workmen).
The workmen is a real server, so we can optimize the `all` json(p) call heavily.

http://rawgit.com/biojs/registry-ui/workmen/client/index.html

Before we deploy this, we should give the package owner a reasonable amount of time to add the "biojs" keyword.