Dynamic changes, fixes #2, #4

Simplified the configuration via etcd to address the issues above.
Now complete minimal configuration will look like:

```bash
etcdctl set /vulcan/upstreams/u1/endpoints/e1 http://localhost:5000
etcdctl set /vulcan/hosts/localhost/locations/loc1/path "/.*"
etcdctl set /vulcan/hosts/localhost/locations/loc1/upstream u1
```

Notice the quotes around path "./*", these are necessary for star to work properly in the regex.