deleting elements that are now incorporated into the kubernetes project

Removing items that are now duplicated in the Kubernetes project - leaving the Kubernetes Build here.
Let me know if I've gone too far, or not enough.

If you could:

1) Modify/add notes at the top of your blog posts...
* https://coreos.com/blog/running-kubernetes-example-on-CoreOS-part-1/ 
* https://coreos.com/blog/running-kubernetes-example-on-CoreOS-part-2/  
...to point out that the set-up instructions are now evolving with the Kubernetes project at: 
* https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/getting-started-guides/coreos/coreos_cloud_config.md

2) Remove the now out of date kubeconfig at: http://storage.googleapis.com/kubernetes/darwin/kubeconfig  

This should reduce some missteps new users may get tripped up on. 

Thanks Kelsey !