Better iTunes-style option, Domain filter, bug fixes

The itunes-style option now writes a basic Manifest.mbdb which is needed by 3rd party backup parsing applications to list file names.

The Info.plist file creation has been re-written to use plistlib

New option to filter files by domain. This can be used to limit the file downloads to a specific application. For example, using --item-types photos and --domain CameraDomain  only the Camera Roll photos will be downloaded.