I could make a PR based on this: https://github.com/denvned/isomorphic-relay/blob/v0.2.1/src/IsomorphicRenderer.js

Currently, _runQueries is an async operation, so it should not be called during server side rendering. That's why I moved it to componentDidMount, which is not called on the server.

isDataReady checks if the data has been already fetched (current implementation is not so important, and might be replaced). If the data is available, initialize with a preloaded state, otherwise with an empty state.

What do you think?