fixed --help option for sub-commands
switched from argv package to operetta
module scope is unchanged, but program path has changed due to different option parsing for sub-commands in operetta.
Merge pull request #9 from koma75/feature/operetta

fixed --help option for sub-commands
fixed spelling in readme
fixed command name in readme
fix object printing in debug mode
fix documentation issues
fix debug logging
added sub-command explanation text
Added start of log message to logger.info for better log legibility.