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

BradErz/kops,reactiveops/kops,sethpollack/kops,pdh/kops,mad01/kops,jnewland/kops,DualSpark/kops,leandrocr/kops,WillemMali/kops,ikropotov/kops,ikropotov/kops,DualSpark/kops,gambol99/kops,zytek/kops,ajitak/kube-deploy,justinsb/kops,blakebarnett/kops,tsupertramp/kops,chrislovecnm/kops,gambol99/kops,dacohen/kops,faraazkhan/kops,andrewsykim/kops,reactiveops/kops,andrewsykim/kops,dacohen/kops,sp-borja-juncosa/kops,spacexnice/kube-deploy,tsupertramp/kops,zytek/kops,robinpercy/kops,sp-borja-juncosa/kops,chrislovecnm/kops,aledbf/kops,pdh/kops,spacexnice/kube-deploy,kris-nova/kops,krousey/kube-deploy,ikropotov/kops,luomiao/kops,sp-borja-juncosa/kops,austinmoore-/kops,reactiveops/kops,leandrocr/kops,gambol99/kops,kris-nova/kops,reactiveops/kops,BradErz/kops,MadDogTechnology/kops,luxas/kube-deploy,WillemMali/kops,faraazkhan/kops,blakebarnett/kops,luxas/kube-deploy,luxas/kube-deploy,blakebarnett/kops,ostrichops/kube-deploy,kris-nova/kops,leandrocr/kops,aledbf/kops,isavin/kube-deploy,faraazkhan/kops,aledbf/kops,ajitak/kube-deploy,kubernetes/kops,austinmoore-/kops,robinpercy/kops,austinmoore-/kops,ostrichops/kube-deploy,pdh/kops,justinsb/kube-deploy,mad01/kops,DualSpark/kops,krousey/kube-deploy,robinpercy/kops,blakebarnett/kops,justinsb/kops,dacohen/kops,mad01/kops,justinsb/kube-deploy,luomiao/kops,kris-nova/kops,sp-borja-juncosa/kops,austinmoore-/kops,dacohen/kops,WillemMali/kops,andrewsykim/kops,aledbf/kops,luomiao/kops,robinpercy/kops,leandrocr/kops,jnewland/kops,sethpollack/kops,andrewsykim/kops,tsupertramp/kops,ostrichops/kube-deploy,zytek/kops,luomiao/kops,justinsb/kube-deploy,gambol99/kops,MadDogTechnology/kops,WillemMali/kops,MadDogTechnology/kops,DualSpark/kops,spacexnice/kube-deploy,isavin/kube-deploy,kubernetes/kops,sethpollack/kops,isavin/kube-deploy,zytek/kops,mad01/kops,sethpollack/kops,BradErz/kops,faraazkhan/kops,MadDogTechnology/kops,jnewland/kops,kubernetes/kops,chrislovecnm/kops,chrislovecnm/kops,pdh/kops,BradErz/kops,ikropotov/kops,justinsb/kops,tsupertramp/kops