Add kube-ui cluster addon for serving k8s dashboard UI.

Changes include:
- Add kube-ui binary for serving static dashboard UI
- Add kube-ui docker image, replication controller, and service
- Make the kube-ui a cluster-addon (enabled by default)
- Split the compiled pkg/ui/datafile.go into separate dashboard and swagger packages
- Update docs to reflect changes

docs/ui.md

@@ -15,6 +15,6 @@ You should now be able to access it by visiting [localhost:8001](http://localhos
 You can also use other web servers to serve the contents of the www/app directory, as described [here](../www/README.md#serving-the-app-during-development). 
 
 ### Running remotely
-When Kubernetes is deployed remotely, the api server deploys the UI. To access it, visit `/static/app/` or `/ui`, which redirects to `/static/app/`, on your master server.
+When Kubernetes is deployed remotely, the api server deploys the UI. To access it, visit `/ui`, which redirects to `/api/v1/proxy/namespaces/default/services/kube-ui/#/dashboard/`, on your master server.
 
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