Added support for saving list of running configurations

[Jeremy Boynes]

I have added a GBean to the system configuration that saves the list of 
currently running configurations when the kernel is shutdown. This list 
is then used on restart to determine what should be started 
automatically. A list of configs on the command line still overrides this.

So, for example, you might do:
java -jar bin/server.jar org/apache/geronimo/DebugConsole
^C (server shuts down cleanly)
java -jar bin/server.jar
and the DebugConsole would automatically be restarted (along with 
anything else that was running or was deployed when the server was up).

--
Jeremy