Release v2.2.0

This version of the SDK includes support for working with OpenTok 2.0 archives. (This API does not
work with OpenTok 1.0 archives.)

This version of the SDK includes a number of improvements in the API design. These include a number
of API changes. See the OpenTok 2.2 SDK Reference for details on the new API.

The API_Config class has been removed. Store your OpenTok API key and API secret in code outside of the SDK files.

The create_session() method has been renamed createSession(). Also, the method has changed to
take one parameter: a SessionProperties object. You now generate a SessionProperties object using a Builder pattern.

The generate_token() method has been renamed generateToken(). Also, the method has changed to
take two parameters: the session ID and a TokenOptions object.