Clean up the clone/fetch output

This makes it match the other output we've got:

```console
$ ./bashbrew/build.sh --no-build --all
Fetching java (git://github.com/docker-library/java) ...
Fetching node (git://github.com/docker-library/node) ...
Processing buildpack-deps:jessie ...
- deferred; FROM debian:jessie
Processing buildpack-deps:latest ...
- deferred; FROM debian:jessie
Processing buildpack-deps:wheezy ...
- deferred; FROM debian:wheezy
Processing busybox:buildroot-2013.08.1 ...
Processing busybox:buildroot-2014.02 ...
Processing busybox:latest ...
Processing busybox:ubuntu-12.04 ...
Processing busybox:ubuntu-14.04 ...
Processing centos:latest ...
Processing centos:centos7 ...
Processing centos:centos6 ...
Processing centos:centos5 ...
Processing cirros:latest ...
Processing cirros:0.3.0 ...
Processing clojure:latest ...
- deferred; FROM java:7
Processing clojure:lein-2.5.0 ...
- deferred; FROM java:7
Processing clojure:lein-2.4.3 ...
- deferred; FROM java:7
Processing crux:latest ...
Processing crux:3.0 ...
Processing debian:jessie ...
Processing debian:oldstable ...
Processing debian:sid ...
....
```
Merge pull request #262 from infosiftr/better-clone-output

Clean up the clone/fetch output