Started transition to JMS.

Added marking queue, and made tutor clients callbacks.

Code cleanup. Been playing with a few different static code analysis ...

tools.  Used them to recommend the changes made in this commit.

Clean up. Fixed logging statements, added private constructors to ...

classes that should never be instantiated.  Fixed author names to be
consistent.

Tweaked tests a bit. StressTest now loops.

Added some additional testing classes.