v3 - 2012-01-26
- Added a version attribute to the JSON payloads.
- Requiring longer timeout for the final message (credentials exchange) to
allow for the account creation flow on Desktop after pairing devices.
v2 - 2011-04-26
- Added support for If-None-Match and If-Match on PUT
requests and the corresponding 412 Precondition Failed response code
to improve reliability on flaky networks.