backlog/207_212_fiware_service_path

This PR 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)
* Appropriate slash occurence treatment in fiware-servicePath (https://github.com/telefonicaid/fiware-connectors/issues/263)

After merging the PR https://github.com/telefonicaid/fiware-connectors/pull/261, this also includes:

* iot_support at tid dot es as official contact email in all the source file headers (https://github.com/telefonicaid/fiware-connectors/issues/260)

DO NOT MERGE YET
Although you explain the part about of concatenation of comma-separated_fields, maybe we should include an example on how it works (to remove any potential doubt, e.g. is concatenation doing just "merging" string or using some separator like comma or dash?)

Eg. "if the entityId is Car1 and the entityType is Car" then "entityId,entityType" will produce "Car1Car" (note that no separator character is used)" or something like that.

By the way, I have one doubt :). In the example you use "entityId,entityType". What happen if I swap the fields position, i.e. "entityType,entityId"? Would I get "CarCar1" as concatenated string? Whatever the case, the behaviour should be documented in the "comma-separated_fields" bullet above.