Docker Support

My busybox save only had two images in it. Rather than chase that, I think it's probably better to make the docs ambiguous, e.g.

diff --git a/docs/user-guide/recipes.rst b/docs/user-guide/recipes.rst
index f64c67b..3d91e31 100644
--- a/docs/user-guide/recipes.rst
+++ b/docs/user-guide/recipes.rst
@@ -70,7 +70,7 @@ Then create a pulp repository and run an upload command with ``pulp-admin``::
     ... completed


-There are now four new images in the pulp repository::
+There are now images in the pulp repository::

     $ pulp-admin docker repo list
     +----------------------------------------------------------------------+
@@ -83,6 +83,11 @@ There are now four new images in the pulp repository::
     Content Unit Counts:
       Docker Image: 4

+.. note::
+
+    The number of images associated with the repository at this point may differ
+    from the number seen above, but should be at least 1 image.

 During an image upload, you can specify the id of an ancestor image
 that should not be uploaded to the repository. In this case, the masked ancestor