UR.IMG.UR non-trivial Nibitaph RESTful macOS/iOS sample now buildable

After a little Saturday morning maintenance, the UR.IMG.UR github repo should be now easily build-able with Xcode 4.6 (macOS) and Xcode 5.1 (iOS 8.x-).

Tidied up the Xcode projects, added some missing resources, updated the Xcode folder references to use the Nibitaph submodules.