Remove registry stuff and switch to better hooks

[cmawhorter]

Related to #37

It'd be nice to have new resource.json -> resources dependencies get automatically detected.

So you can do yarn add my-company/some-microservice-with-api-client-bundled

On postinstall, the presence of a resource.json in that dependency would lead to its policy automatically being added to package.json (if a policy exists for that service)

[cmawhorter]

#72 and #73 relate

[cmawhorter]

fixed in upcoming v2