Add wiki page for local cluster setup.

Hi All,

I was working in getting the guestbook working in a local cluster. I thought it might be useful to have some detailed instructions about how to do this. Basically, I'm taking the guestbook and making some slight changes to make it work locally. 

Also, I added a vagrant file with some provisioning to set up a virtual machine ready to run Kubernetes locally. 
kubelet should be able to pull these images? Why pre-pull?