TODO merge into security deletion commit
Our customizable auth filter is now part of PicketLink 2.6.0-SNAPSHOT
Added final auth scheme behaviours required by the tutorial app
Also need to preserve query params on redirect from host page to login page
Now using Errai's AuthenticationService to obtain current user
Getting ServletContext from Errai now, since UberFireServlet is gone
The SecurityExtension is no longer a thing
Updated showcase for new server-side security setup