This commit updates versions of RDBMS and Redis Docker images used in integration tests. Closes gh-894
Demonstrates using Spring Session to lookup a user's session by the username. The sample provides a hook to add the current username to the session (required for finding the user) by providing a custom implementation of Spring Security's `AuthenticationSuccessHandler`. NOTE: This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com