ISettings now uses unique_ptr
All Photo* are now unique_ptr's or const ref.
All ImportPhoto* are now unique_ptr or const ref
All PhotoReconcilerStrategy* now unique_ptr
All DatabaseStorage* are now unique_ptr's
All PhotoMapper* are now shared_ptr's
All PhotoGateway* are now unique_ptr's
All PhotoReconciler* are now unique_ptr's
Merge branch 'issue-10' into develop