Add compression functionality to StorageManager

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Stop Save(title) from being called in zipped mode

 - Need to think of what this would do:
   - Add to archive? or
   - Create new archive containing copy of single source directory

Signed-off-by: James Tasker <james_tasker1@hotmail.com>