[WIP][DO_NOT_MERGE] Initial implementation of Config creation

This PR contains initial support for Config creation for the Origin `kubecfg` client. There is an example Config JSON (same format as you get when you use templateConfig for generation).

To try this out, you can execute this command:

```
$ openshift kube apply -c pkg/config/example/config.json
```

The the client will create the resources in following order: Services, Pods, ReplicationControllers. 

FYI: This PR bundles https://github.com/openshift/origin/pull/41 because I need Config{} object.
@VojtechVitek `Apply()` cannot receive Config object as we are not using `configapi.Config` but raw JSON. For that I have `configJSON` struct which is private and it serves just as a temporary storage for JSON deserialization.

`execute.go` I can think of `apply.go`, any better suggestions?