fixed copying parent id
Merge branch 'CDB-3913' of github.com:CartoDB/cartodb into CDB-3913
Merge branch 'CDB-3913' of github.com:CartoDB/cartodb into CDB-3913
fixed parser in layers to include parent_id
don't serialize more than needed
Merge branch 'CDB-3913' of github.com:CartoDB/cartodb into CDB-3913
enable overlays for slide visualization so the overlays are serialized/restored
updated cdb submodule
Merge branch 'CDB-3913' of github.com:CartoDB/cartodb into CDB-3913