Feature/109

This PR adds a TDAF-compliant Conversion Pattern to log4j, including a transaction id. The README and some templates have been modified accordingly.

The issue #109 will be completed when all the traces are revised; this is necessary to create the alarm conditions table.
Fixed in https://github.com/telefonicaid/fiware-connectors/commit/df86f31bf40f153313e81d62f45fefaa9b57e016