backlog/207_212_fiware_service_path

This issue implements/fixes several backlog features and issues:

* Use the `fiware-servicePath` header (https://github.com/telefonicaid/fiware-connectors/issues/212)
* Common character set when naming persistence elements (https://github.com/telefonicaid/fiware-connectors/issues/207)
* The organization is not created in column mode anymore (https://github.com/telefonicaid/fiware-connectors/issues/181).

DO NOT MERGE YET
"In addition, a destination dataset containing the destination entity has to be configured."

This is a bit obscure... I (and probably others) may tend to think on CKAN when hearding about "dataset", but, what about in other sinks? Examples here could help.