Introduce UIKit class extensions with alert builder
Minor client project file reorganization

In CopyFiles section.
Harden pagination info initialization
Minor authenticator cleanup and fixup
Minor defines cleanup
Minor alert builder refinement
Refactor sample app delegate view controller setup
Fixup sample app custom url identifier
Complete implementation and integration of implicit auth

- Redirect path needs to be an optional config value.
- Correct Redirect URI generation.
- Harden authenticate and finish authenticate methods.
- App delegate now just owns an account.
- People view controller needs delayed fetching.

Note the explicit redirect path configs in the
sample app are for demo purposes.