Handle auto-created properties

[gknobloch]

By default, auto-created properties like jcr:primaryType will not be overlaid as you might not be able to respect the node type currently under /libs.

You will have to explicitly hide that property and redine it to change such a property.

• Create the node under /apps with the desired jcr:primaryType
• Set sling:hideProperties = jcr:primaryType