backlog/215

This PR implements the issue https://github.com/telefonicaid/fiware-connectors/issues/215
I understand that you have replaced "organization" by "service" in this paragrpah (good!) but "servicePath" (related with Fiware-ServicePath) is not described (although in the `hdfs://` line above it is included).

Don't forget to mention the sub directory nature of `<servicePath>`.