As I said in the previous PR, no output is shown when running make pull, which could lead to silent pull errors:

```
><> make pull
for host in 172.17.8.100 ; do ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null core@$host 'for c in builder cache controller database logger registry router; do docker pull deis/$c; done'; done
Warning: Permanently added '172.17.8.100' (RSA) to the list of known hosts.
Warning: Permanently added '172.17.8.100' (RSA) to the list of known hosts.
Pulling repository deis/builder

















Pulling repository deis/cache
```