Patches for Log4r

• root loggers are no longer null loggers – you can add outputters to them

• the global logger is used to set a global log level (root is no longer used for this)

• yaml configurator has been updated to handle new root logger semantics

• yaml configurator has been updated to accept a set of files AND sections (default section: log4r_config)

What this really means is that you can set up one outputter in the root logger to manage the default logging behavior.