Neo4j reader

Work in progress. Since I'm completely new to Spring, I don't know whether I'm doing anything correctly, but I'm roughly following the [Hubway code](https://github.com/jexp/hubway-sdn).

I'm not even sure how to try it out -- what needs to be done to set up Spring and then call `importStations`, for instance?

If the parsing tweaks look good, I could create another pull request to go ahead and merge just those.