Properly serialize pages
Properly serialize pages

If you promote a type from a Piece to a Page then the serialisation
fails. This helps.

SpontaneousCMS/spontaneous,SpontaneousCMS/spontaneous,mediagreenhouse/spontaneous,mediagreenhouse/spontaneous,SpontaneousCMS/spontaneous,opendesk/spontaneous,mediagreenhouse/spontaneous,opendesk/spontaneous,opendesk/spontaneous