A Little Easier EasyLogging

In need of easier access to thresholding, I added some more methods:

one to pull the current threshold level,

five to interrogate the current threshold with respect to a given level, and

five to set the current threshold level

as they relate to the default logger. These are available as mixed-in methods on the EasyLog Module and class methods of EasyLogger class.

Additionally, I added special support for writing empty log messages to aid in grouping related log entries.

I extended the earlier paper with a description of their use, and have added them to in the eymiha_util-1.0.2 rubygem in my Chunks of Ruby Infrastructure project on RubyForge.