Bump MODULE_VERSION to 5.2.2

Change-Id: Ic173a32836639e664e8349b28b101ee26a45ff78
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Use correct method signature for slots.

Change-Id: I09b5df218ad22afefe8a615c80585aa3fb46006f
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Lorn Potter <lorn.potter@jollamobile.com>