DEVIDM-58: Renamed pnr to nin in the system and chomping nin to ssn before using it both against ladok and sukat
DEVIDM-58: Changed Eventlog.socialSecurityNumber to Eventlog.userId since binding identification to a specific attribute is too specific for the use case we're trying to handle. Also makes it bothersome to change the attribute if we wish to.
Merge pull request #65 from tomma/DEVIDM-58

DEVIDM-58: pnr changed to nin and nin turned to ssn where needed.