Binary deploy

This is a big change that'll break everything except GCE and Vagrant.  I wanted to fix everything but it is hard to test and this PR is already way too big.

Basically, we are now building and packaging binaries (built in a Docker container) and using these for the deploy.  This means we are no longer installing golang and building source on the worker machines.

Fixes #1351.

After this gets in I'll spawn new bugs to deal with the following issues:
* [ ] Rationalize `build/` directory with `hack/` directory
* [ ] nsinit install is disabled as there is no binary release or vendoring
* Fix cluster deploy scripts for environments that are dependent on our salt scripts
  * [ ] Azure @jeffmendoza 
  * [ ] VSphere @pietern 
  * [ ] Rackspace @doublerr
  * [ ] oVirt @simon3z 
  * [ ] Local @derekwaynecarr 

You can check out a recent binary release here: http://storage.googleapis.com/kubernetes-releases-56726/devel/kubernetes.tar.gz.
There's a problem using `local` with a `$(...)` expression that the `local` will hide an error on the latter... And here you want to know if mktemp failed. (Yes, this is really stupid, but that's bash for you...)

https://google-styleguide.googlecode.com/svn/trunk/shell.xml?showone=Use_Local_Variables#Use_Local_Variables

```shell
  local kube_temp
  kube_temp=$(mktemp -d -t kubernetes.XXXXXX)
```