Added license checking and download skeletons - need logic

api-doc/reference/Admin-API.v1.yaml

api-doc/reference/Nameserver-API.v1.yaml

api-doc/reference/User-API.v1.yaml

.../main/java/net/jami/jams/nameserver/PublicNameServer.java

...c/main/java/net/jami/jams/server/core/TomcatLauncher.java

...t/jami/jams/server/servlets/api/update/UpdateServlet.java

.../main/java/net/jami/jams/server/update/SFLTrustStore.java

...ain/java/net/jami/jams/server/update/UpdateCheckTask.java

...c/main/java/net/jami/jams/server/update/UpdateDaemon.java

...in/java/net/jami/jams/server/update/UpdateDownloader.java