camptocamp/cgxp — pull request #614 by sbrunner (2013-11-08 10:53:21+00:00)
Title: Manage all case we can do with the API using the backgroundLayers

The defaultBaseLayerRef isn't in backgroundLayers
The orthoRef isn't in backgroundLayers
We have only one layer who is a background layer
We have only one layer who is the ortho layer