Swap meta and properties

/resources/{resourceId}/properties -> /resources/{resourceId}/meta.
X-OADA-File-Metadata became X-OADA-Resource-Properties. This name scheme better
maps to typical file systems and makes the meaning of /meta more clear.
/configs now a hierarchy that maps to a resource

/config/what/ever/hierarchy/you/want maps to a resource id and href that
contains the actual configuration.