Incremental commit: preprocessor logic and UUID code for when IDFA cannot be used
Updated to use identifierForVendor
NCT-13: Impl idv in device object to capture identifierForVendor
NCT-13: added explanation to UNAVAILABLE as IDFA setting
Merge pull request #16 from socialize/feature/nct-13

NCT-13: logic to selectively remove IDFA from Socialize SDK

OK per code review (with one chore created for factory refactor)