Registering ForEachLine servers

These servers were lost in the service registry (presumably) once Behaviors were switched to including registration modules.

This is slightly smelly since it re-adds the module -- sending the registration message again seems to sensible, but re-defining the simple_name class method does not make as much sense (since the parent class already did this!)
Locating services in the ServiceRegistry

This is an experiment; it moves the Ruby class-finding logic out of CommandLineConfiguration.  Instead, the ServiceRegistry looks these up by name.
Remove unused parameter