Data persistence

This minor pre-release takes steps to persisting the data to the session. The session can be the default PHP $_SESSION superglobal, or any class that implements the SessionContainer interface, as supplied by PHP.Gt/Session.

Using an object-oriented session handler allows developers to encapsulate the session data from the rest of their application and third party dependencies, which is really important for writing secure applications.

The login flow is started in this release, redirecting the user agent to the remote Authwave provider.