Added refToMessageId in Kvittering objects.
Updated keystore initiation and added temporary certificate to test sending to MF. The certificate itself should not be checked in!
Merge branch 'call-api' of github.com:digipost/sikker-digital-post-klient into create-asice

Modified files that required new signatures (because of modified XSD).

Conflicts:
	src/test/java/no/difi/sdp/client/SikkerDigitalPostKlientTest.java