deis/deis — pull request #2443 by johanneswuerbach (2014-11-10 07:54:32+00:00)
Title: fix(*): Handling of unavailable services

Send http code 503 for not running services.

This improves messaging when a service is temporarily unavailable and fails app health checks pinging `/` when all instances of an app are offline.

Example with a stopped controller you receive now:
```
$ deis apps
503 Service Temporarily Unavailable

503 Service Temporarily Unavailable

503 Service Temporarily Unavailable

nginx/1.6.2

```
Fixes #2161