Investigate a snapshot/restore approach for upgrading the downloadable cartridge

OpenShift currently provides a backup and restore feature for applications that might allow us to solve our upgrade issue with downloadable cartridges. In particular, it might be possible for a user to:

1. Create a snapshot of an older AeroGear cartridge instance
2. Create a new cartridge instance using the latest downloadable cartridge
3. Use the snapshot to restore the new instance's database/configuration to the state in the snapshot

Need to determine whether or not this works and what snapshot/restore action hooks will be needed.