restore gamer/statemachine/configurable/*.java from googlecode @r614 

The statemachine/configurable directory (with ConfigurableGamer.java) is missing from the code recently ported to github.  This adds back these files that Sam maintained up to r614 on the svn repo at code.google.com. Presumably they can be used to compile a ConfigurablePlayer.jar file for use in the coursera.org assignments and contain example implementations of various game players.