Updated to use etcd backend and SkyDNS v2

This was a way to provide an easy way to test our one custom javascript file such that it would immitate `Run(Context)` but not commit anything.

example output:
```bash
2014/07/12 00:47:51 Creating Docker client using endpoint: unix:///var/run/docker.sock
2014/07/12 00:47:51 Creating plugin runtime: plugins/default.js
2014/07/12 00:47:51 loading plugins from plugins/default.js
2014/07/12 00:47:51 Creating etcd client using endpoints: [http://10.0.42.1:4001]
2014/07/12 00:47:51 Would add (/skydns/local/skydns/nostalgic_heisenberg): {"host":"10.0.0.11"}
```