added logging set up

Outputting info messages to starscream console makes it difficult/frustrating to use. Created a console specific log4j config file which only dumps WARN level messages to console but INFO to a tmp logfile. This will make it easier to use the console but still have some info about what the cluster is doing during a session.

If this gets accepted I will point the starscream console to this config file on bootup.

@airhorns @honkfestival