Comments:
- Added a new public metadata namespace ( OVERLAY_LAYOUT_METADATA : "http://www.osmf.org/layout/overlay/1.0";)
- no other API changes
Notes:
- separated index property in a different metadata namespace ( OverlayLayoutMetadata class ) in order to preserve the default metadata behavior
- Parallel elements are now setting the index ( if not already set by developer ) on its childs based on the order in which they are added ( see ParallelDisplayObjectTrait constructor )
- unit tests also updated