Added tests for normal versus verbose logging.
Minor code refactoring to improve readability.
Added tests for detecting custom template changes.
Renamed RealFileConverterFactory to MarkdownToHtmlFileConverterFactory.
Bridged the logging to Maven in the MagistoMojo.

Magisto uses standard Java logging. I added some configuration code
to disable the console logging, and to bridge the logging to Maven's
log system instead.