implement record add/remove for ultradns

[codefromthecrypt]

Here's how to add a record

ResourceRecord toAdd = rrBuilder().name("www." + zoneName).type("A").ttl(1800).rdata("1.2.3.4").build();

String guid = ultra.getResourceRecordApiForZone(zoneName).create(toAdd);

Here's how to remove a record

api =  ultra.getResourceRecordApiForZone(zoneName);
toDelete = api.listByNameAndType("www." + zoneName, "A").tryFind(rdataEquals("1.2.3.4");
if (toDelete.isPresent())
   api.delete(toDelete.get().getGuid());