Fixed the appliance build.

Squashed commit of the following:

commit 018742157aaf14d7b970ef36d72ae647d356ca9e
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Tue Oct 21 11:33:22 2014 +0100

    Fixed the build.

    * Not deleting default images from docker fixed the btrfs problem
      * This was done in scripts/enable-docker-containers.sh
    * Authenticate to Quay with QUAY_TOKEN env var
    * Pull down squashed image from Quay
    * Documented build process
    * Fixed up the Makefile

commit c08d1032329a72174197f7af6424cb1a2796e8d2
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Tue Oct 21 00:42:22 2014 +0100

    Remove unneeded nice and obsolete comment.

commit bd6c52efe950d86938d797da5d2214464e5eef61
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Sat Oct 18 21:54:34 2014 +0100

    Remove cruft

commit 576fae9db0c9ceac722230507fc89493eb2c1fe6
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Sat Oct 18 21:47:26 2014 +0100

    Docker provisioning

commit 046c2abab13f3d12bee36f455f64de83d02db21b
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Mon Oct 6 12:52:28 2014 +0100

    Added a question

commit 7dc2a2689e8b85dcd91f532c8601ff1b170bf0df
Author: Julien Biezemans <jb@jbpros.com>
Date:   Mon Oct 6 13:52:15 2014 +0200

    Enable docker containers

commit 1b6e9665fcf82651e4f0ce2c504253ef42645eae
Author: Aslak Hellesøy <aslak.hellesoy@gmail.com>
Date:   Mon Oct 6 11:38:16 2014 +0100

    Some work to provision docker containers onto machine.