Multiple nodes

With multiple nodes
```
---
environment:
  :nodes:
  - :host: 127.0.0.1
    :http_port: 8989
    :pb_port: 9090
  - :host: 127.0.0.2
    :http_port: 8989
    :pb_port: 9090
```
With single node
```
---
development:
- :host: 0.0.0.0
test:
- :host: 0.0.0.0
  :http_port: 15000
  :pb_port: 15001
production:
- :host: fancy.production.server.1
```