NFC and Timing

For a background on NFC and Race Timing see:

NFC: https://docs.google.com/presentation/d/143SLh2WeljSMbFR4bxvjjj69--sZhi8fKuo8JD2GiW8/edit?hl=en_US

and

In-App Billing: https://docs.google.com/present/edit?id=0AVLn1B-fUxK9ZGNtOWhtYjhfNTNkcHc0cW5kYg&hl=en_US