Support Daemonsets

[zapman449]

When I try to diff a daemonset, I get

$ kubediff ./logstash-es.yaml
## default/logstash-elasticsearch (DaemonSet)

Error from server: daemonsets.extensions "logstash-elasticsearch" not found

But kubectl finds it:

$ kubectl get daemonset logstash-elasticsearch
NAME                     DESIRED   CURRENT   NODE-SELECTOR   AGE
logstash-elasticsearch   5         5         <none>          23h

Details:

kubectl version
Client Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.5", GitCommit:"5a0a696437ad35c133c0c8493f7e9d22b0f9b81b", GitTreeState:"clean", BuildDate:"2016-10-29T01:38:40Z", GoVersion:"go1.7.1", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.5", GitCommit:"5a0a696437ad35c133c0c8493f7e9d22b0f9b81b", GitTreeState:"clean", BuildDate:"2016-10-29T01:32:42Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}