* add comment
* adding key in state PUBLISH for the sync:
  * in PUBLISH state, the key is not ready but the DNSKEY are publish in DNS in order to make DS update
* initial version of the opendnssec-notificator
  + push update to a temporary file
* add the feature : do not commit DS changes if there is no changes
* First (untested with opendnssec) version of the updateDS script for OpenDNSSEC