HouseTrip/elba — pull request #3 by adamof (2014-02-28 14:46:45+00:00)
Title: [#66667110] Adds command to list instances attached to a load balancer

For the maintenance app we need a command to list all the machines attached to a certain load balancer.

```
$ elba help attached
Usage:
elba attached BALANCER

Options:
p, [--porcelain] # Prints the list in a machine readable format

Prints the list of instances attached to a balancer
```

```
$ elba attached testing-loadbalancer
* testing-loadbalancer
- i-886613c1
- i-fe6613b7
```